Apparently TWA did have at least one 737-200, but I believe it was a Boeing trial sales pitch. The particular plane actually became a SWA 737 but registered with a TWA R/N and does not show as ever being registered to TWA. It was scrapped at El Paso in 2013. Here is a picture of the real thing, TWA and SWA:(see attached; I have yet to figure out how to post a picture within a post!)
Boeing 737-2H4(A) N732TW
CN 22731
MSN 22731
In addition, perhaps a TWA Express linkup with one or more -200 operators might have existed for a short period??
Captain Sim makes an excellent 737-200 for FSX and is relatively cheap. It is similar quality to their 707 and 727, which, IMHO, are superb in all respects.
Ah!. Dont know about the link up possibilities. I dont believe that type of arrangement existed in the day. Airlines were still strong and independent entities that didnt cotton much to another airline butting into their business.
On the other hand, with todays environment, i could easily see the one world alliance, which we're part of, doing yearly excursion flights on the old girl much like you can get with trains. Unfortunately, aircraft, unlike trains, are flown twenty four hours a day, seven days a week till their airframes give out and they have to be retired for safety's sake.