Negative. Have done some touchy/feely, but no more than that.
Same. I discussed it with a couple of girls at different points, but we decided the bathrooms were just too small and we didn't think we could get away with it as it would be obvious we went in together to the airline attendants or passengers near the bathrooms.
I do have one airline regret. I once sat next to this girl from the UAE in college or law school (forget which). I was flying home for a visit and she was on her way back home to the UAE for a wedding and had a layover in Philly. We hit it off instantly. She clearly had family money and after awhile offered to bring me to the wedding and pay for the ticket and my lodging. I declined because I had just started dating somebody at the time and wanted to let that play out. We had this awkward disappointing goodbye type thing when we landed and I could tell she was looking at me like I was blowing an opportunity. Looking back I wish I would have gone not necessarily because it's a regret about the particular girl but because that would have been a really cool experience.
There's probably a thread about this on here somewhere frankly.