I'm not sure if it's bad for T but I was on an airplane 2 months ago (no cold or sickness) and it was really uncomfortable since I had to constantly...seriously constantly for 1.5 hrs, pop/unplug my ears or I couldn't hear well and the pressure was rough. I can't explain it since I never had this problem before T. I don't look forward to getting on another plane again due to this. My parents live in a mountainous area and the same happens to me when I drive there....constantly unpopping my ears. It's a strange thing that was never this much of an issue before T.