FWIW:
ExpressJet
Reserve Rules
Short Call Reserve - 2 hour call out.
Long Call Reserve - 12 hour call out.
At least 10% of reserve lines will be long call. Can be converted to short call with 12 hour notice.
Lineholder rules apply once reserve pilot is assigned and released to show time (no requirement to answer phone).
Reserve pilot automatically released if not reassigned before block in of last segment. No ACARS reassignment.
Reserve automatically released at 1800 local on last day in a block of reserve days. And for airport standby, automatically release 30 minutes after last aircraft takes off.
Airport Standby (4 hours) - paid at 4 hours or trip value, whichever is greater.
Can only assign 6 ASB per bid month, not two days in a row, not the last day in a block of reserve days, and cannot be assigned outside of domicile.
Aggressive Pick Up Window allowed for reserve pilots.
Floating Reserve Lines - 2 extra days off.
The largest block of days off for reserve pilots are immovable.
Bad day worse day reserve day trades.

 

You will if you are at Endeavor based in New York... this place is obsessed with airport reserve especially for the "just in case of IROP in NYC"

 

For Xjet, will also note, if assigned a trip on airport standby, it must be scheduled to depart within the original footprint of your standby. If you're on noon to 4pm standby, they can't call you at 3:55 and assign you a flight that leaves at 4:30.