Despite a common belief, the aircraft in storage at the AMARC are not "broken up", even those there as a result of the SALT II are not "broken up" either. All are disassembled to render them inoperable, or to use the military jargon, deweaponized. Although rendered not useful as designed, they are perfectly useful for scavanging parts off them, which is what the USAF techs have been doing for decades.
This by the way brings me to a somewhat comical start of the latest Star Wars sequel I watched the other day.
One of the main characters is shown scavanging a part off a crashed Imperial Stardestroyer ship, and the question I asked is...how the hell does a woman in early teens, with no apparent technical knowledge or supporting schematic documentation, locate a fist-size part in the body of a vessel several miles long? :-) And, the parts trader then, without so much as referencing a screen, tells her it is of minimal value! One assumes the trader's extraordinary knowledge of presumably classified Imperial Stardestoryer systems and sub-systems down to small components...and if he has THIS level of knowledge, why is he just a scavenged parts trader on Tatooine and not a senior design engineer with the Evil Empire? :-)
It got worse from there :-)
The film was underwhealming