Roger that. That's pretty good. When I was an ATC'er, the contract didn't apply, nor could you be a union member, while still in training in OKC (about 2 to 3 months). The first day you showed up at your domicile (facility), you were fair game to become a union member (open shop). Probation started from hire date, for one year.

SkyWest is similar. Contract provisions don't apply until you've completed training, in effect, day one of IOE. Probation is similar to above, one year from hire date.