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You searched for objects where the object has images 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 the query mode is to match the entire phrase
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airmail flight cover: United Air Lines, first jet mail service, AM-1
03/18/1960
2012.040.003
 
airmail flight cover: United Air Lines, San Francisco - New York route, 20th anniversary
09/08/1940
2012.149.1567
 
airmail flight cover: United Air Lines, Douglas DC-7, San Francisco - New York route
06/01/1954
2014.156.214 a b
 
airmail flight cover: Los Angeles - New York route
10/01/1934
2014.156.167
 
airmail flight cover: FAM-30, United Air Lines, Mainliner 300
05/01/1947
2012.149.1673
 
airmail flight cover: United Air Lines, National Air Mail Week
05/18/1938
2015.052.002
 
airmail flight cover: 4-cent airmail postage stamp, United Air Lines
09/03/1954
2015.168.785