Texas Subcategories This category has the following 13 subcategories, out of 13 total. 0–9 Twin-engined aircraft (12 C, 3 P) Three-engined aircraft (6 C, 6 P) Four-engined aircraft (7 C, 1 P) Five-engined aircraft (3 C) Six-engined aircraft (5 C) Seven-engined aircraft (1 C) Eight-engined aircraft (3 C) Nine-engined aircraft (2 C) Ten-engined aircraft (2 C, 4 P) Twelve-engined aircraft (2 C) Fourteen-engined aircraft (2 C)M Mixed-power aircraft (2 C, 27 P)P Push-pull aircraft (8 C)