The first official new United States point to receive air mail service after the outbreak of World War II, Bellingham was added to Air Mail Route 57 as of the date shown. 

An official pictorial cachet was provided. 

This cover was carried on the inaugural United Airlines from Bellingham, Washington to Vancouver, Canada (where it was backstamped) and is listed in the Contract Air Mail Flights (CAM) section of The American Air Mail Catalogue as 57N3.