While traveling in the United States, the Pope has been flying on an American Airlines Boeing 777. Not surprisingly, American has been milking the trip for public relations value.
I don't know how this agreement works. I imagine the Vatican is paying for the charter. But do you suppose it gets a price break over the usual cost of the charter? It's definitely good for business for American to transport the Pope.
Here are some pictures of the Pope's 777, courtesy of American Airlines.