The presidents of the United States, France, and Brazil are on a plane

At one point, the president of the United States sticks his hand out the window and proclaims,

"We are flying over the US."

The others ask how he knows.

"Because I just touched the Statue of Liberty."

A while later, the president of France sticks his hand out the window and says,

"We are flying over France!"

The other two ask how he knows, to which he replies,

"Because I just touched the Eiffel Tower!"

Finally, hours later, the president of Brazil sticks his hand out the window and states,

"Ah, now we are flying over Brazil."

The others ask how he knows.

"Because they just took my watch."