Flying out of and coming into terminal 4 at Sky Harbor was pretty painless. Curbside check in at Southwest Airlines makes it pretty easy to get your bag checked quickly and off to your gate. TSA is usually pretty quick here and generally the are fairly nice as well. There's a ton of different places to eat and get a drink while you wait. Many different food options and Starbucks coffee of course. Show up at lest 1.5 hrs before your flight though cause this is an extremely busy airport.