The oldest plane I've flown in was the Boeing Stratocruiser
Careful, you're showing your age!
My knowledge of tri-motors was sadly deficient.
Something i have learned over the years, in regards to aircraft history, is that there's always more weird shit to find and if it's happened once, it's probably happened at least twice somewhere else as well.
As an example, of course you've heard of the Harrier jumpjet right? And you might have heard about the Yak-38 that is roughly similar idea but somewhat different concept... Buuut, how many know that Germany designed TWO different "jumpjet" fighters, the EWR VJ 101 and VFW VAK, 2 and 3 prototypes built and flown respectively, but preceeded by Focke Wulf 260 and 300, which were supposed to be VTOL passenger aircraft, while the Dornier 31 from just a few years later also got a triplet of prototypes built.
France built 1 of the Dassault Balzac V and at least 1 of another i now cannot find the name of but IIRC it was built by SNECMA.
And then just a couple of years ago, i found that here in Sweden, the SAAB-35 Draken was actually in heavy competition during the design phase with an almost finished design for a jumpjet fighter, and that it wasn't until the latter was almost completed that it was dropped(barely).
And i found that Fokker got as far as building a mockup and several windtunnel models for a jumpjet design...
And that's just what i've pretty much stumbled blindly upon, because most of these, i never ever heard about them before mostly randomly finding out about them. And several of them could easily be mistaken for another.
And for another excellent example, Concorde and Tu-144, the latter often maligned as a "poor copy" of the former, despite the fact that the designers of the latter not getting access to anything more than some vague rumours about the Concorde until the -144 design was already mostly complete. And as noted by one of the designers, the parts they by then might have been interested in copying, they could not, for the simple but somewhat stupid reason that one plane was designed in metric, the other, very much was not, and trying to make the two play nicely with each other would have generated a ridiculous amount of additional, mostly useless, work.
They look alike because both sides engineers had roughly the same design requirements and access to similar levels of understanding and knowledge about aeronautics, with some differences in material engineering and manufacturing abilities causing the greatest differences.
IF the -144 had been designed a decade later, at the time when Soviet aircraft engineers were assimilating the aeronautic understanding that resulted in the MiG-29 and Su-27, it wouldn't matter if they had a perfect copy of the Concored blueprints, the end result -144 would have been markedly different because the aeronautical advances were simply too good to not use them. Difference on the same level as if USA had built a contemporary to the Concorde after gaining the aeronautics understanding required for the F-22, which is a similar development to what the Soviet's learned prior to the -29 and -27 designs.
Yet if you look, you can find a proposed US "ConcordUSA", from the same time, and what do you know, the model looked almost like a copy of Concord.
Eh, i'm rambling. Anyway, the point was that it's quite amazing how many similar aircraft tend to be designed at roughly the same time, even when the designers have zero knowledge of each other, while at the same time, there's no end to the weird shit that sometimes pops up when someone gets a brilliant(or not) idea.
The asymmetrical planes made by Blohm&Voss during WWII is a good example of the latter. And just the idea of using oblique wings, sheesh. With Burt Rutan taking up the job of producing the weirdest possible more recently.
I like air museums.
Strangely, despite being far too much of an aircraft nerd when i was young (i was very seriously looking at getting a pilot certificate by age 18, until i found just how badly affected my tendency towards motion sickness is by actual flight, not good, really not a good idea), i've never actually been to an air museum.