I operated N537MC which sadly is close to death down in Roswell now but it was one of the ex TIA birds and although it was heavy it also had the increased gross weight modifications and the max landing weight was 302,092KG as opposed to the more usual 285 ish. It wouldn't make stage 3 with 30 flaps so it was a 25 flap plane at the higher landing weights. It was a lovely old bird. Still had the gold T wallpaper in the crapper too!