A340-541: Trent 553
A340-542/642: Trent 556
A340-643: Trent 560
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That makes a lot more sense now.
Also, the -311 seems to be the most underpowered of them all, with CFM 56-5C2 engines.
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With the recent confirmation of the destruction of the An-225, the 747, for the first time, is the longest operational aircraft in the world (although it will soon lose this title to the 777-9)
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this also means the a380, is officially, now the largest plane in the world. that sounds like something a non-avgeek would say tho 
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It depends on what you’re measuring
The 747 is the longest and the Stratolaunch still has the longest wingspan
But the A380 is the heaviest
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The A330 and the A340 share the same MSN (example: There’s no A340 MSN 12 because MSN 12 is an A330)
That also explains why there are some A340s with MSN beyond 1000
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Lockheed had full development plans for building a commercial version of the C-5 Galaxy designated the L-500, but it never came off the drawing board due to the success of the Boeing 747 series and the development cost of the military variant and the L1011
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Lockheed’s internal designation for the C-5 appears to be L-500 as well
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Isn’t that weird though
Like the 767-X which was a reverse 747 
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Interestingly Lufthansa was one of the main airlines interested in the concept, so much so that Lockheed made a scale model of the aircraft for the airline, which is now on display:
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No thanks I’m good
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Cool Lufty DC-9 there as well
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Fun fact: The original MTOW of the A350-900 was 268t during its entry to service in 2014. The 280t variant was initially only available to A350-900ULR customers; it wasn’t until 2020 that Airbus announced that customers of the standard A350-900 could select the higher MTOW variant.
There are also variants in between, with their MTOWs being 272, 275 and 278t. Philippine Airlines selected the 278t A350-900HGW for its flights to New York without payload restrictions.
The A350 Type Certificate Data Sheet also includes MTOWs of 217, 235, 240, 250, 255, 260, 268, 272, 275, 277, 278, 280 and 283 t.
Source
The range showed by Airbus for the 268t A350 was originally 8100nm but the figure has been reduced to 7750nm with 315 passengers by 2014.
The 8100nm range shown on the Airbus website corresponds to the 280t variant with 325 passengers on board.
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During WWII, VASP reverse engineered their Ju-52s and used to produce it’s own replacement parts for them. This gave them such a maintenance expertise that, along with their fleet of some 30+ 737-200s, they were the ones that maintained FAB’s 737-200s, even after the airline went bankrupt.
Boeing calibrates their commercial aircraft through giant compass roses painted on the apron at Renton and Everett! You can see these through Google Earth, though the paint doesn’t show for some reason:
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To put into perspective how small the 737-100 was, the shortest DC-9, the -10 which could hold about 78 passengers in a one class layout, is 104.4ft long compared to 93ft for the B731.
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Brazilian Air Force’s F-5s not only are the most modernized and well-equipped F-5s in the world, but also so much so that they’re actually considered 4th gen fighters.
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