So here are five things you need to know about squawk codes when it's time to give that explanation. Squawk codes are unique four-digit numbers ranging from 0000 to 7777 set on an aircraft ...
A transponder is crucial for identifying aircraft. There are 3 types of transponders: Mode A, Mode C, and Mode S. Significant squawk codes to remember: 7700, 7600, 7500, 7000/1200, 2000.