not sure what the count is on the 320, as far as qualified f.o.'s, but there seems to be for the moment anyway, enough qualified f.o.'s on the big bus to come back to the bus-let for commands...in a few years this might change..have never seen commands here given on preference to nationality or otherwise..but if they run out of qualified f.o.'s then all bets are off I suppose..seniority is understood to have a by-pass provision, hiring DEC's is much more of a "seniority breach" than by-passing senior f.o.'s without the requirements for command...I'll bet the senior f.o.'s will avoid any new fleet as it will most likely "lock" them in position for a period of time..in any event when the bypassed f.o.'s do upgrade, then they are automatically senior to the folks who bypassed them...