FlyDeltaJets From United States of America, joined Feb 2006, 1787 posts, RR: 2
Reply 2, posted (5 years 4 weeks 9 hours ago) and read 2477 times:
we usually have 1 or 2 spare a/c in the station depending on the day of the week. That number can sometimes be higher. Yes they are rolling spares meaning that they arrive to JFK to stay as the spare for that day and more than likely leave the next day. Also some planes stay here because they are being repaired so they are not spares but dead aircraft.