The term 'AIRPORT GUESSES, FOR SHORT' refers to two abbreviations: ETAS and ETDS. ETAS stands for Estimated Time of Arrival at the Airport, which is an estimate of when a plane will arrive at its destination. ETDS stands for Estimated Time of Departure from the Airport, which is an estimate of when a plane will leave its origin. Both ETAS and ETDS are used by airlines and airports to help manage their operations.