WASHINGTON, USA (AP) - President Barack Obama is still getting used to some details of his new life, including the fact he has to duck when boarding his presidential helicopter.

WASHINGTON, USA - President Barack Obama waves and learns the door on Marine One is much shorter than he is, and bumps his head slightly, yesterday, as he leaves for a trip to Andrews Air Force Base, Maryland and then onto Elkhart, Indiana to hold a town hall meeting on the American Recovery and Reinvestment Plan. (Photo: AP)

The six-foot-one-inch (1.83-metre) Obama bumped his head yesterday when boarding Marine One on the White House's south lawn. He misjudged the doorway and banged his head on the low edge.

It was Obama's fifth flight aboard the helicopter, which ferried him to Andrews Air Force Base in Maryland. He then flew on Air Force One to Indiana to promote an economic stimulus package that Congress is weighing.