I'll take a stab at it based on the provided info: Riddle Grad (or similar), went to a regional for ATP and the E170 Type then left (for whatever reason) to a place like ATI or ABX for the 757 type and now looking to leave... Or has already left. The story here, however, is in the details and the "why".

As previously stated to the OP, you need to provide more information about what you are looking for in a company; i.e. Pay, QOL, domicile locations, etc. Regardless of your history, which leads to plenty of speculation, how do you expect to get useful information without providing what you're looking for in a company?