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by Allen J. Sheinman | August 20, 2018

allenTravel from Los Angeles International Airport to San Francisco International Airport and the reverse trip took the top two spots on the list of most disrupted flight routes over Labor Day Weekend 2017, according to data revealed by AirHelp, an air-passenger rights group. AirHelp says the same routes likely will score in the dysfunctional derby this year as well.

A record high of more than 16 million people traveled by plane in the U.S. over that last Labor Day Weekend, according to AirHelp, which defines the period as from Thursday, Aug. 31, through Tuesday, Sept. 5.

Here are the top 10 flight routes that proved most susceptible to delays or cancellations over last year’s Labor Day Weekend — and possibly this year’s as well: