Delta is experiencing an abnormally high volume of flight cancellations compared to its mainline counterparts. SAUL LOEB / AFP via Getty Images Delta canceled hundreds of flights this weekend, while American and United canceled a handful. An internal memo obtained by Business Insider shows the reason is crew scheduling. Delta is using a complex scheduling system to fill last-minute trips, which can be inefficient. Delta Air Lines is canceling hundreds of flights — far more than its competitors