The best way to see other deaf people is to fly to/from DC or Rochester, NY when Gallaudet and RIT starts their breaks/classes start up. I just had a flight with 4 other deaf people when returning home from school! Two were deliberately flying together as they lived near to each other but the rest of us didn't know. I don't walk up the aisle to check for deaf people, I typically see them at the gate area or even at the baggage claim sometimes!

Now about International Sign Language- it's rather rude to see hearing people push that idea so hard as sign languages are not something new, they have rich and storied histories in their countries. I wouldn't give up ASL to learn some sort of ISL to fulfill the fantasies of ignorant hearing people. Why do hearing people think I should be able to communicate with deaf people in any country I go to when the same is not true for spoken languages? Just look at Esperanto. It failed. ISL will not take off too because the deaf people do NOT want or need one. Please stop pushing this idea on us.

I recently had a flight where the FA insisted on trying to mime/randomly sign out the safety speech. She didn't even know a sign, she just made it up all. It was absurd and kind of offensive. I vastly prefer watching the safety video with captions or being handed a transcript of the speech (it's only happened once to me which is a shame because it's pretty much the best way if there's no CC). I found Continental to be the best airline to fly on in regards of accommodation for the deaf which is why I was sad when they merged with UA as UA doesn't really try to make any accommodations.