Questions & Answers about Uçak gecikti.
Turkish does not use articles like “a” or “the.” Whether uçak is understood as “a plane” or “the plane” depends entirely on context. If you really need to say “a plane,” you can add bir:
Bir uçak gecikti.
If you want to specify “that plane,” you could use a demonstrative:
O uçak gecikti.
gecikti = gecik- (root meaning “be late” or “delay”) + -ti (past-tense marker that also implies 3rd-person singular in Turkish) + [no extra suffix for “he/she/it”].
In more technical terms:
• Root: gecik-
• Past tense suffix: -di (here voiced as -ti)
• 3rd-person singular: zero ending