Depends on upgrades and movement. Newhires are going to IAD, PHX, and DFW out of training. But it's a highly transitional time and things are changing constantly. A few months ago everyone did time in IAD. Hard to predict exactly when you will be able to hold DFW or phx, but most likely right out of training. If not, the following month most likely. Record times in the last few years to not be stuck in IAD so it doesn't really matter. You'll get there soon enough.