Originally Posted by benzoate

JFK and BOS fluctuate on who is the most junior. As far as aircraft deliveries its hard to tell. Any given year we take delivery of a number of aircraft but on the flip side many aircraft are leases and returned. It's sometime difficult to pin down the exact number of deliveries. Jetblue will also shift flying based on need and time of year so flying is not always consistent in a base.
Sorry the answer isn't more specific.