Eh? Seat lock FO's???????? Surely the job market is tighter for Captains? Why "seat lock" Fo's when you can farm the constant supply of those desperate for a job, whether they be experienced disillusioned guys from a european loco or low houred cadets to supply EK. Experienced captains have, and always will be harder to attract. If they start denying guys an upgrade, people will vote with their feet.