As of today, American Airlines will join US Airways' operation at Phoenix Sky Harbor Airport while they attempt to co-locate operations across their network. After last night's final departure, American Airlines stopped operations at Terminal 3. This move is meant to introduce a smoother experience for Phoenix employees as well as flight customers. From this morning on, All of their ticketing and check-in, gates, bags, etc. will work out of terminal 4 instead of 3. Apart from the benefits aforementioned, this move will help Admiral Club's members conveniently access 3 US Airways Club without having to change terminals.