Editing Lockheed U-2 (section)

===Primary list===
[[File:NASA ER-2.jpg|thumb|right|A NASA ER-2 atmospheric research aircraft in flight (2008)]]
:Subsection source: ''Aerospaceweb.org''<ref>[http://www.aerospaceweb.org/aircraft/recon/u2/ "Lockheed U-2 Dragon Lady: Tactical Reconnaissance."] {{Webarchive|url=http://arquivo.pt/wayback/20090707060403/http://www.aerospaceweb.org/aircraft/recon/u2/ |date=7 July 2009 }} ''Aerospaceweb''. Retrieved: 8 March 2009.</ref>

;U-2A: Initial production, single-seat; [[Pratt & Whitney J57-P-37A]] engine; 48 built
;U-2B: Proposed missile warning patrol aircraft; not built.{{sfn|Pocock|2000|pp=136–145}}
;U-2C: Enhanced single-seat model with [[Pratt & Whitney J75-P-13]] engine and modified engine intakes
;U-2D: 2 seat used for various IR detection programs, not a trainer aircraft.{{citation needed|date=April 2016}}
;U-2CT: Enhanced two-seat trainer.
;U-2E: Aerial refueling capable, J57-powered
;U-2F: Aerial refueling capable, J75-powered
;U-2G: C-models modified with reinforced landing gear, added [[Tailhook|arresting hook]], and lift dump spoilers on the wings for [[U.S. Navy]] carrier operations; three converted
;U-2H: Aircraft carrier capable, aerial refueling capable
;U-2R: Re-designed airframes enlarged nearly 30 percent with underwing pods and increased fuel capacity; 14 built
;U-2RT: Enhanced two-seat R-model trainer; one built
;U-2EPX: Proposed U.S. Navy maritime [[surveillance]] R-model; two built

;TR-1A: A third production batch of U-2R aircraft built for high-altitude tactical reconnaissance missions with the [[ASARS-2|ASARS-2 side-looking radar]], new [[avionics]], and improved [[Electronic countermeasures|ECM]] equipment; 33 built. Re-designated U-2R after the fall of the Soviet Union.
;TR-1B: Two TR-1A airframes completed as two-seat conversion trainers
;TU-2S: New redesignated TR-1B two-seat trainer with improved engine; five converted
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| caption = The second ER-2 (lead aircraft) and two U-2Ss on a demonstration flight from [[Moffett Field]] before moving to [[Edwards Air Force Base]], 1996. The farthest aircraft was modified from the first ER-2.<ref>{{Cite web|title=USAF Serial Number Search Results|url=http://cgibin.rcn.com/jeremy.k/cgi-bin/gzUsafSearch.pl?target=80-1063&content=|access-date=2021-09-05|website=cgibin.rcn.com|archive-date=29 September 2022|archive-url=https://web.archive.org/web/20220929211707/http://cgibin.rcn.com/jeremy.k/cgi-bin/gzUsafSearch.pl?target=80-1063&content=|url-status=live}}</ref>
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;ER-2: Two TR-1A airframes, AF Ser. No. 80-1063, and Ser. No. 80-1097, modified as Earth resources research aircraft, moved from USAF to NASA and operated by the NASA High-Altitude Missions Branch, [[Ames Research Center]]. NASA flies Ser. No. 80-1097 as N809NA and Ser. No. 80-1063 as N806NA. 
;U-2S{{anchor|U-2S}}: Redesignation of the TR-1A and U-2R aircraft with updated [[General Electric F118]] engine, improved sensors, and addition of a [[GPS]] receiver; 31 converted
;WU-2: Atmospheric/weather research WU-model