I often say that the best internet service is the one you never notice. With steady buffering and long load times, AT&T Internet Air never let me forget that I was using it. I have as friendly a testing environment as you’ll ever find for an internet provider. I live alone in a one-bedroom apartment, and the list of connected devices I own is shockingly short: just my iPhone SE, Apple TV 4K and MacBook Pro that I use to work from home. That’s not much strain to put on a…