Still my #1 choice for my photography: wide gamut, true calibration, friendly pixel density.
Used 11 and 13-inch MacBook Air at OWC
Turn Off iTunesHelper
I plug my phone into my Mac mainly to charge it; I do not want the obnoxious iTunes window popping up just because I want to charge my phone.
Go into the Accounts system preference control panel, select your login account, select iTunesHelper, then hit the “-” button (you might also have to unlock to the lock at lower left, not shown).