cursive lynx Mar 17, 2026, 5:13 PM

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The internally-known Boeing Model 767 (Not to be confused with the later Boeing 767) was a series of proposals forwarded by Boeing to NASA under a program in 1971 dubbed A.T.T. - "Advanced Transport Technology".

The goals of A.T.T. were to create a Mach 1 airliner, utilising the historically low fuel prices of the period, and proposed cutting-edge technologies and brand-new fuselage designs to reduce drag. The A.T.T. program was shortly shelved and ultimately forgotten during the 1980's oil crisis.

The full story of the Model 767 series is extensive and its documentation largely niche, lending to its short program life due to the fuel crisis. However, details are plentiful through the proposals that were considered, with the mock-up for the tri-jet (and quad-jet T.A.C. program) configurations existing.

To note, Lockheed and general dynamics (under Convair) also submitted their own plans to the A.T.T. program, but were not developed as far as the Boeing Model 767-611 specifically.

I also believe this transonic aircraft could benefit further than its immediate sum and give it a secondary useful purpose; as a transition for players new to the game. Transonic aircraft can bridge the gap between subsonic aircraft and super-sonic transport aircraft, just like the Coronado 990A.

Relevant attached documentation and photographs show the rich information within the Boeing Model 767 and A.T.T. program.

Boeing Model 767-611 specifications

Cruise speed: Mach 0.98
Cruise altitude: 30000 feet
Range: 3000 miles / 5560 kilometers
Maximum payload: 40000 pounds / 18100 kilograms
Maximum passenger configuration: 199

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Boeing A.T.T. - Final results

📎 19790075807_1979075807.pdf

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NASA - "ADVANCED SUBSONIC N74-16729
LONG-HAUL TRANSPORT TERMINAL AREA
COMPATIBILITY STUDY."

📎 19740008616_1974008616.pdf

odd stirrup Mar 17, 2026, 5:17 PM

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SuperDread

hazy niche Mar 17, 2026, 5:17 PM

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shock

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I hope there is nothing wrong because id love this

cursive lynx Mar 17, 2026, 5:18 PM

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Honestly the hardest part was finding the mockups

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all the data is in those documents

hazy niche Mar 17, 2026, 5:18 PM

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Bro even provided the un-classified documents forgive

hazy niche Mar 17, 2026, 5:19 PM

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cursive lynx all the data is in those documents

Id think its probably enough to prove it did exist

vague nacelle Mar 17, 2026, 5:21 PM

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e

cursive lynx Mar 17, 2026, 5:45 PM

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here's another scan, unfortunately the full resolution is paywalled. sigh.

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also i think the altitude is more realistically 40,000ft as shown in the wing design loads, initial cruise altitude isn't maximum cruise altitude. ill leave it at 30,000ft though as-is, just a bit of discretion.

graceful geode Mar 17, 2026, 6:37 PM

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Hell yes

orchid ivy Mar 17, 2026, 6:41 PM

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Surprisingly good blueprints for something with no mockup (?)

cursive lynx Mar 17, 2026, 6:42 PM

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Whoops! forgot to attach it

orchid ivy Mar 17, 2026, 6:42 PM

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Seems to be a scale model rather than a development mockup

cursive lynx Mar 17, 2026, 6:42 PM

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Above is the T.A.C model

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yeah, my bad

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since the wind tunnel testing was so extensive, lending to the nasa-joint project, that is quite a heavy justification in lieu of a 1:1 mockup

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but if its not acceptable, fair enough.

vivid heron Mar 17, 2026, 7:13 PM

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Peak…

rose nexus Mar 17, 2026, 7:20 PM

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I'm not sure but i think this is the NASA mock-up. It really looks like it and as far as i can trackit it comes from a correct source but i don't have a good visual at the tail to confirm it has a third engine.

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But the wings looks like they are at a lower angle attached...

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and as immage description this

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''Boeing 767 NTF correlation test-611 11ft. w.t.''

cursive lynx Mar 17, 2026, 7:25 PM

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Yep! but that engine configuration is different from the -611. there's also these three images from the windtunnel testing, but the third engine is missing...?