Commercial pilot and a specific plane?

Hi everyone! I am new to this forum. I am very addicted to avaition. I love to fly and explore world. I love to travel.

Anyways, i got a question here. I’m just wondering. Being a commercial pilot, do you have a specific plane to fly/pilot on? I mean if you fly a plane reg N8302F, you will fly that plane everytime you have a flight? Or every flight, you have to change from aircraft to aircraft?

It depends.
If you are flying for Bob’s corner drugstore and Bob has one airplane that is the one you will fly.
If, on the other hand, you are flying 737’s for Southern Slobovia airlines you will fly all of them.