USPS 1997 Classic American Aircraft - Sheet of Twenty Stamps Scott 3142 New sheet of (20) stamps (catalog #3142) no longer sold by USPS. Features 20 images of classic aircraft while in flight Perfect gift for fans of aviation, aircraft as well as pilots, aircraft, military, veterans Great for raffles, conference giveaways, fan clubs, fundraisers, souvenirs. Collectors item. High quality item professionally packaged in a white Stay Flat envelope.