I called a few months back and asked about that too. I was told to apply at 500 hours and I believe you will get a phone interview. Then you should keep updating and then they will give you the formal interview around 900-1100 hours or so. I was told 1050 at the time I called. As a piston PIC you can make 30K your first year. Beats the pants off 19K at the regionals. And I believe upgrade to captain on the Lear is much faster than capt upgrades at the regionals. I plan to instruct until I have the time and the definitely apply.