1949 6¢ Air Post - Wright Brothers Mint Plate Block

United States #C45 6¢ Air Post - Wright Brothers Mint Single

United States #C40 6¢ Air Post - Alexandria, Virginia Mint Plate Block

United States #C39 6¢ Air Post - DC-4 Skymaster (as C33) Mint Plate Block

United States #C44 25¢ Air Post - Plane & Globe Mint Plate Block

United States #C42 10¢ Air Post - Post Office 150th Anniversary Mint Plate Block