Answers: We are not legitimately limited to a single type. However it is VERY expensive to train a pilot and maintain them current in a unquestionable type of aircraft. For this reason, most pilots are stuck on just one equipment type until they bid for another one. That is to say, until an introductory comes up on another equipment and they take that one instead.
Every 6 months we must endure a simulator check where we move about through emergency procedures, limitations, and all sorts of things approaching that. It is a strenuous affair and maintaining more than one type currency would be exhausting and expensive for the company. It is not impossible, purely difficult and pricey.
You can operate a maximum of 3 different types as long as they are in duplicate performance class. If you fly contained by different performance classes you can lone operate 2 types. (usually the more similar the aircraft are the easier you can operate more types. 2 types is usual, but you might find 3 when flying for a smaller airline with mutch different types.)
This is what's valid surrounded by my country, I'm not sure what are the FAA requirements (in case of Alaska). You should inform something like this with the flight crew license department or with a pilot training facility.
You will probably stick next to one or the other in this valise. However, you may end up surrounded by all of the models of 737.
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