Was doing some research for an article that I was going to write for Kokpit and came to a shocking surprise that THY is one of the few airlines that has 9 abreast seating on 777. Looks like pretty much everyone and their mother switched to 10 abreast seating. I am surprised that this feature is never used by the airline for marketing purposes.
Have other airlines with 10 abreast also 349 or more seats?
KLM has 3-4-3 seating on 77Ws in Y, and even in 3-class (J/Y+/Y) configuration, contains 408 seats. Also, Air China recently started 2-class 77Ws, also with 3-4-3 in Y, with 392 seats. Air India maintains 3-3-3 seating on 77Ws in Y, with 342 seats in total, which is close to TK's capacity on most 77Ws.
However, one should also not forget the 3 ex-Kenya Airways 77Ws (TC-LKA/B/C) that TK leases for its India routes (DEL/BOM), which are 3-3-3 in Y, but have a whopping 400 seats (they have only 28 J seats)! I have had the chance to ride these birds twice so far, and the economy cabin in them is MASSIVE, and super LONG .
6E, 9W, AF, AI, B6, BA, BI, BR, CA, DN, GA, IC, JL, KB, KL, KU, NH, QR, SQ, TG, TK, UA, VS