Does UA allow any open vacancy to be filled during training, or are specific classes for specific vacancies

For example- 30 open EWR A320, 10 open LAX 756, 10 open LAX 737.

Can anyone in the class bid for any one of those vacancies, or will they have a class specifically for like 30 A320. Or 10 737, 10 756, 10 A320 and can only bid for what’s offered?


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