In reality, the keyboard should be cleaned or replaced, and the computer inspected to be sure the juice did not penetrate any further. I don't know about MBP keyboards, but if it had happened to my iBook, I would take the keyboard out and rinse it thoroughly with deionized water until all traces of the juice were gone. I'd probably remove the keycaps to do this. Then I would let it air dry until it was bone dry, maybe setting it up with a fan blowing on it. But removing the MBP keyboard is a lot more involved than the iBook keyboard, and I don't even know if it's feasible to clean it this way. It may not be.
To see what might be involved, you could find your MBP on this link and download the service manual for it:
Index of Stratton Service Manuals
http://node123.cit.geneseo.edu/~stratton/ServiceManuals/
The airline should pay for whatever needs to be done. Even though you didn't get the name of the flight attendant at the time, you still have your flight information and the airline will know who was on duty then. It would be worth a call to the airline's customer service department. I would imagine that they have insurance for this sort of thing. I think calling them is worth a try.
Good luck!