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You searched for objects where the collection is Aviation Archive and the subcategory is Airmail Flight Cover and the airline is United Air Lines or United Aircraft Corporation or United Airlines or United Express or United Shuttle and decade is 1940 and the query mode is to match the entire phrase
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airmail flight cover: United Air Lines, San Francisco - New York route, 20th anniversary
09/08/1940
2012.149.1567
 
airmail flight cover: FAM-30, United Air Lines, Mainliner 300
05/01/1947
2012.149.1673