Resign and then return
 

Have you all ever heard of a pilot resigning his position due to personal issues and then getting back on with the carrier when issues are resolved?

no, but i've head of people taking personal leave

i've heard of people quitting to go to another airline and then come back..

are airlines pretty receptive of that

what about if a pilot chooses to leave to get further schooling (i.e. masters/law degree)...and then wants to come back after, any difficulty, do you have to go through the whole process again, or do they allow you to slide back in somehow?

Definitely request a Leave of Absence. Several people I know have done this for school and the like. Best is that your hire date just keeps getting older. Presto, instant captain.

I had to cancel an interview and then come back. Does that count?

what office at the airline should a pilot call if they want to get back on?

chief
HR

Call your flight manager.

I thought you already quit...