An independent study challenges the Transportation Department's position that new rules on tarmac delays have produced no noticeable increase in flight cancellations. Research from Airline Zone and Marks Aviation found a 26% jump in cancellations since last May, and many of those may have been indirectly affected by the rule on tarmac delays. The DOT responded to the study by pointing out that only 16 planes sat on the tarmac longer than three hours in the May-to-January period, compared to 605 such delays a year earlier.

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