I think it depends on the actual aircraft and its maintance... there is a big difference between planes, even when they are exactly the same model, also depending on weight for a certain flight, weather conditions and other considerations that have an impact on the noise they make.
Exactly. I have been in 100s Airbus, Boeing, McDonnell Douglas, Bombardier, etc.
Some Airbuses are loud, some Boeing's are loud. The newer airplanes are better, and the 737 will always suck, thanks to Southwest. The new Airbuses are advertised as some as the quietest, A350 and A380... however... have a bad door seal squealing the whole flight and the "stats" don't matter. Be prepared.
Earplugs or earmuffs, whatever you can tolerate. With muffs, you could have wired earbuds (on low), underneath to watch a movie on an 8 hour flight... I just did a 14:30 flight.
Earplug (foams are fine) should be on the second you leave your house if you have hyperacusis. The airport is loud, people putting luggage, slamming the overhead is loud, the PA announcements are loud (95db on a flight a week ago). Heck, you can run into poorly behaved children anywhere... but on planes and trains... you can't get away.
If someone's ear bled after a flight... you have bigger issues. :-(
Pressurization... NO valsalva!!! Too many people do this without knowing the proper way and they cause bigger problems.
@Candy CHEW GUM, SWALLOW, move your jaw, yawn... bring AFRIN.
Some airports do not sell gum, FYI... so bring it with you.
I have mentioned these things before but it gets lost in the 100s of topics and threads. If you wear noise cancelling headphones, have even a 10dB earplugs in just in case under them... or a sealing earbud will do the same function... I still don't trust the ANC headphones with possible 16kHz side tones.