When I flew to Chicago for xmas, LGA was packed. Only at the tellers. The ATMs were wide open but I had run out of ink in the printer and never made an e ticket. I knew I had email in my iphone.
(and yes, I have an iphone. I bought it two days before getting assigned the Droid project and if I could break my contract I would. So stop smirking.)
On a hunch, I opened my gmail account, pulled up my email ticket, and used the gestures to make it the right size. Then I ran it under the scanner.
It worked. And it worked on the way home too. I haven't heard of anybody doing this before but I'm sure it will work for you.
And I'm sure it will work on a Droid ;)