One of my travel-related pet peeves is the wide variety of audio jacks. Sometimes my phone, my iPad, and the airplane all have different ones.
No matter where I fly, I bring multiple sets of headphones. On this trip, I kept my larger noise-canceling headphones at home to save space.
Instead, I brought in-ear Bluetooth wireless headphones for my phone, in-ear wired headphones with a flat jack, and ones with a traditional round jack. Plus, I had a special smaller pair of over-ear headphones for my son.
I wanted to ensure that no matter which device my son or I used, we had a pair of headphones that worked.
Of course, I also brought two device chargers to keep everything juiced up.