MESA Entrance Practice Exam

In aviation shorthand, A/C is the common way to write “aircraft” (you often see it as A/C in schedules and notes). Among two-letter codes, AC fits this interpretation because it can be read as the same abbreviation with the slash implied—A/C. The other codes are standard airline designators for specific carriers, so they don’t denote the word “aircraft.” Therefore, AC is the one that corresponds to Aircraft.