Editing Convair XC-99 (section)

==Operational history==
[[File:Convair XC-99 and B-36B in flight c1949.jpg|thumb|right|The XC-99 in flight with a B-36B]]
[[File:XC-99.png|thumb|right|The XC-99 landing during flight test trial]]

In July 1950, the XC-99 flew its first cargo mission, "Operation Elephant." It transported {{convert|101266|lb|kg}} of cargo, including engines and propellers for the B-36, from [[San Diego]] to [[Kelly Field Annex|Kelly Air Force Base]] in [[San Antonio, Texas]], a record it would later break when it lifted {{convert|104000|lb|kg|abbr=on|-2}} from an airfield at {{convert|5000|ft|m|abbr=on}} elevation. In 1951, the aircraft was retrofitted with 3,800hp Pratt & Whitney R-4360-53 engines, landing gear was strengthened and a cargo-loading system installed, including an internal elevator. Bins were developed to enable quick loading of the aircraft - it was estimated the aircraft could be loaded in as little as 30 minutes.<ref>{{cite journal|journal=Aviation Week|date=16 August 1954 |title=Airlift Helps AMC Cut Logistics Knots |url=https://archive.aviationweek.com/issue/19540816|page=140|volume=61|number=7|issn=0005-2175}}</ref>

In August 1953, the XC-99 would make its longest flight, {{convert|12000|mi|km|abbr=on|-3}}, to [[Rhein-Main Air Base]], [[Germany]], by way of [[Kindley Air Force Base]], [[Bermuda]] and [[Lajes Field]] in the [[Azores]]. It carried more than {{convert|60000|lb|kg|abbr=on|-3}} each way. It attracted much attention everywhere it flew. The US Air Force determined that it had no need for such a large, long-range transport at that time, and no more were ordered. The sole XC-99 served until 1957, including much use during the [[Korean War]]. It made twice weekly trips from Kelly AFB to the aircraft depot at [[McClellan Air Force Base]], [[California]], transporting supplies and parts for the B-36 bomber while returning by way of other bases or depots making pick-ups and deliveries along the way.