No, you are given Space Available travel to PHX on UAL. (You are not yet an employee, haven't passed background, DOT drug test, etc; they essentially don't care if you are late.) However no newhires in my upgrade class (we were half new hires half upgrades) said they had trouble getting to PHX.

You are given Positive Space travel to STL from PHX on UAL. (Confirmed Ticket with seat assignment) You are an employee at this point.