So on FSX the World Travel Airlines 737-800 is in a very different livery from that of the World Travel 747 and A321. Once while on A.net I saw the old livery of India's Jet Airways on a 737 and thought it looked just like the World Travel one. Sure enough it has the same color scheme, same cheatline, and same font on the airline name; only big difference is the tail. AFAIK, Microsoft has never released any aircraft painted in the style of any real-world airline. Why did the designers do this? It is the aircraft featured in the Limited Options mission where the airliner is flying from the Seychelles to India and loses an engine, so I suppose they were thinking of Jet Airways when they created it.
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Photo © J.C.A.M - Singapore Aviation Spotters