Local TV said a grenade had been fired at the domestic hub, which is occupied by the People's Alliance for Democracy.
The PAD has occupied Don Mueang and the capital's main airport since last week.
Meanwhile a protest by pro-government activists has forced the constitutional court to move a final hearing on a case that could see the ruling party banned.
In a statement, the court said the hearing would be moved to Bangkok's administrative court and would begin at 1000 (0300 GMT).
Judges are set to decide whether Prime Minister Somchai Wongsawat's People Power Party (PPP) and two of its coalition partners committed electoral fraud.
If they are found guilty, Mr Somchai could be banned from politics and many cabinet ministers could be forced to step down.
Shrapnel
Emergency services officials said the explosion at Don Mueang airport had occurred shortly after midnight (1700 GMT) on Tuesday, and killed a male PAD activist.
Channel 7 television said a grenade had been fired from a nearby flyover and hit a terminal window, spraying protesters with shrapnel.
Officials told local TV that a grenade had been fired from a nearby flyover
The incident came just hours after the PAD ended a three-month protest at the prime minister's offices in central Bangkok.
The group's leaders had told them to move to the domestic hub and the main Suvarnabhumi International Airport for their own safety after a grenade attack at Government House injured at least 49 of them on Sunday.
The PAD also agreed on Monday to allow 88 aircraft stranded at Suvarnabhumi airport to leave, but without any passengers. The planes will move to other local airports to help evacuate travellers.
At least 100,000 foreign visitors have been unable to leave the country since the anti-government activists occupied the airport's main terminal last week.
Thousands of pro-government protesters also besieged Bangkok on Sunday in a counter-demonstration.
The PAD accuses Mr Somchai's government of being corrupt and hostile to the country's much-revered monarchy, and has demanded they resign. They also accuse him of being a proxy of his brother-in-law, exiled former Prime Minister Thaksin Shinawatra.
On Monday, the prime minister insisted he would not step down.
"I will not quit and I will not dissolve parliament," he told reporters in the northern city of Chiang Mai.
Monday, December 1, 2008
Clinton named secretary of state
Mr Obama described the former first lady as a woman of "tremendous stature" who had his "complete confidence".
Mrs Clinton lost out to Mr Obama when the two contested a bitterly fought race for the Democratic Party presidential nomination.
At a news conference in Chicago, Mr Obama also announced nominations for other key National Security team posts.
Mr Obama said the time had come for a "new dawn of American leadership to overcome the challenges of the 21st century, and to seize the opportunities embedded in those challenges".
Mr Obama said Robert Gates would remain as defence secretary, while retired Marine Gen. James Jones was named as White House national security adviser.
Former Justice Department official Eric Holder was nominated as attorney general and Arizona Governor Janet Napolitano as secretary of homeland security.
OBAMA'S SECURITY TEAM
Secretary of State: Hillary Clinton
Defence Secretary: Robert Gates
National Security Adviser: General James Jones
Department of Homeland Security: Janet Napolitano
Ambassador to the UN: Susan Rice
Attorney General: Eric Holder
A balanced foreign team
Obama's team so far
Send us your comments
Mr Obama's foreign policy team team under Hillary Clinton will reassure the more hawkish elements in the US, but might disappoint those who wanted a more radical shift, says BBC News website world affairs correspondent Paul Reynolds.
Mr Obama said of Mrs Clinton: "She's an American of tremendous stature who will have my complete confidence, who knows many of the world's leaders, who will command respect in every capital, and who will clearly have the ability to advance our interests around the world."
"Hillary's appointment is a sign to friend and foe of the seriousness of my commitment to renew American diplomacy and restore our alliances," said Mr Obama.
Although the two repeatedly clashed during the nomination race, Mrs Clinton went on to campaign for Mr Obama as he took on Republican John McCain in the race for the White House.
Complicated agreement
Former president Bill Clinton had cleared the way for his wife's appointment by reaching a complicated agreement on his financial arrangements, reports said.
The American people have demanded not just a new direction at home, but a new effort to renew America's standing in the world as a force for positive change
Hillary Clinton
Correspondents said there had been fears her nomination could falter over the appearance of conflicts of interest between her husband's charitable foundation and lucrative speechmaking schedule.
Mr Clinton has agreed to release the list of donors to his foundation by the end of the year, officials overseeing the presidential transition said.
He has also agreed to submit future engagements, speeches and sources of income to the State Department and the White House and to take a more behind-the-scenes role in the daily running of his foundation, sources said.
'Energy and intellect'
Mrs Clinton pledged to give the job "her all".
"The American people have demanded not just a new direction at home, but a new effort to renew America's standing in the world as a force for positive change," she said.
We will also ensure that we have the strategy - and resources - to succeed against al-Qaeda and the Taleban
Barack Obama
The current secretary of state, Condoleezza Rice, praised Mrs Clinton as an "inspiration" who would "bring enormous energy and intellect" to the role.
"And most important I know her to be somebody who has what you need most in this job: which is a deep love of the United States of America."
Announcing his team, President-elect Obama said: "The national security challenges we face are just as great and just as urgent as our economic crisis."
Announcing that Robert Gates would remain in his job, Mr Obama said he would be given "a new mission" to "responsibly" end the war in Iraq.
"We will also ensure that we have the strategy - and resources - to succeed against al Qaeda and the Taleban," said Mr Obama.
Mr Gates said he was 'deeply honoured' to be asked to continue
Selecting Mr Gates - who was appointed by President George W Bush two years ago - allows Mr Obama to honour a promise to name at least one Republican cabinet member.
The BBC's Justin Webb in Washington says the re-appointment of Mr Gates is a sign of pragmatism that will please those who had urged Mr Obama to be cautious, but could also upset those who had wanted a clean break from the previous administration.
Mr Gates said he was "deeply honoured" to be asked to continue and that he did so with "a profound sense of personal responsibility, to and for our men and women in uniform and their families".
Retired General James Jones - a former top commander of Nato and US forces in Europe - was nominated as national security adviser.
He served in the Bush administration as a Middle East adviser.
Mrs Clinton lost out to Mr Obama when the two contested a bitterly fought race for the Democratic Party presidential nomination.
At a news conference in Chicago, Mr Obama also announced nominations for other key National Security team posts.
Mr Obama said the time had come for a "new dawn of American leadership to overcome the challenges of the 21st century, and to seize the opportunities embedded in those challenges".
Mr Obama said Robert Gates would remain as defence secretary, while retired Marine Gen. James Jones was named as White House national security adviser.
Former Justice Department official Eric Holder was nominated as attorney general and Arizona Governor Janet Napolitano as secretary of homeland security.
OBAMA'S SECURITY TEAM
Secretary of State: Hillary Clinton
Defence Secretary: Robert Gates
National Security Adviser: General James Jones
Department of Homeland Security: Janet Napolitano
Ambassador to the UN: Susan Rice
Attorney General: Eric Holder
A balanced foreign team
Obama's team so far
Send us your comments
Mr Obama's foreign policy team team under Hillary Clinton will reassure the more hawkish elements in the US, but might disappoint those who wanted a more radical shift, says BBC News website world affairs correspondent Paul Reynolds.
Mr Obama said of Mrs Clinton: "She's an American of tremendous stature who will have my complete confidence, who knows many of the world's leaders, who will command respect in every capital, and who will clearly have the ability to advance our interests around the world."
"Hillary's appointment is a sign to friend and foe of the seriousness of my commitment to renew American diplomacy and restore our alliances," said Mr Obama.
Although the two repeatedly clashed during the nomination race, Mrs Clinton went on to campaign for Mr Obama as he took on Republican John McCain in the race for the White House.
Complicated agreement
Former president Bill Clinton had cleared the way for his wife's appointment by reaching a complicated agreement on his financial arrangements, reports said.
The American people have demanded not just a new direction at home, but a new effort to renew America's standing in the world as a force for positive change
Hillary Clinton
Correspondents said there had been fears her nomination could falter over the appearance of conflicts of interest between her husband's charitable foundation and lucrative speechmaking schedule.
Mr Clinton has agreed to release the list of donors to his foundation by the end of the year, officials overseeing the presidential transition said.
He has also agreed to submit future engagements, speeches and sources of income to the State Department and the White House and to take a more behind-the-scenes role in the daily running of his foundation, sources said.
'Energy and intellect'
Mrs Clinton pledged to give the job "her all".
"The American people have demanded not just a new direction at home, but a new effort to renew America's standing in the world as a force for positive change," she said.
We will also ensure that we have the strategy - and resources - to succeed against al-Qaeda and the Taleban
Barack Obama
The current secretary of state, Condoleezza Rice, praised Mrs Clinton as an "inspiration" who would "bring enormous energy and intellect" to the role.
"And most important I know her to be somebody who has what you need most in this job: which is a deep love of the United States of America."
Announcing his team, President-elect Obama said: "The national security challenges we face are just as great and just as urgent as our economic crisis."
Announcing that Robert Gates would remain in his job, Mr Obama said he would be given "a new mission" to "responsibly" end the war in Iraq.
"We will also ensure that we have the strategy - and resources - to succeed against al Qaeda and the Taleban," said Mr Obama.
Mr Gates said he was 'deeply honoured' to be asked to continue
Selecting Mr Gates - who was appointed by President George W Bush two years ago - allows Mr Obama to honour a promise to name at least one Republican cabinet member.
The BBC's Justin Webb in Washington says the re-appointment of Mr Gates is a sign of pragmatism that will please those who had urged Mr Obama to be cautious, but could also upset those who had wanted a clean break from the previous administration.
Mr Gates said he was "deeply honoured" to be asked to continue and that he did so with "a profound sense of personal responsibility, to and for our men and women in uniform and their families".
Retired General James Jones - a former top commander of Nato and US forces in Europe - was nominated as national security adviser.
He served in the Bush administration as a Middle East adviser.
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