I just got assigned hotel standby from r24. I have been looking at the contract for some guidance. Look at 25.M.3,4 and 5 for reserve first fly and 4.H.1.a for leveling. I didn't see anything that prevents scheds from putting a "first fly" on airport standby. If you are r24, the company must first put you in hotel standby, then airport standby if needed. A side letter that is the result of a grievance states that the company can send an r24 reserve directly to airport standby only if there is an operational emergency. If you are regular r-a or r-b, I don't see anything preventing first fly from being given airport standby.