Pepsi. Regular, chilled if possible with no ice.

When I drink diet sodas I feel like I"m drinking jet fuel. BLEH!

Coca Cola is good for upset stomaches and other illnesses I've heard.

But for me it's Pepsi (which makes me happy to fly United )

There is Flyertalk legend that when I took the Pepsi challenge I chose Coke. Well, I did the challenge in Toronto and with that pure cane sugar I was fooled!