Paul Allen's personal airplane collection, possibly the richest airplane collector there is

It's said to have 50 aircraft, possibly open to the public, at Everett Washington, near Seattle.

The planes are both retired and found, from forests and jungles.

http://www.warhistoryonline.com/war-articles/inside-microsoft-mogul-paul-allens-multi-million-dollar-wwii-airplane-collection-2.html

P 51 going to estate sale auction, Torrence California, June 1st

Preview is By Appointment Only: Call Sean 714-264-5740
 Deposit Required to Bid: Cashier's Check Only; $25,000 for P-51; $2,500 total for Temco Swift, Packard Rolls Merlin and PT-22 Project
 Final Payment by June 9th, Cashier's Check or Bank Wire Only
Removal: By Appointment Only

http://www.estatesales.net/CA/Torrance/90505/872457  and  https://www.warhistoryonline.com/military-vehicle-news/for-sale-1944-north-american-p-51d-mustang.html