OREANDA-NEWS. The final tallies from Delta’s busiest-ever summer operation are in. And they're impressive, to say the least.

The marquee standouts are eight new records never achieved by Delta in its long history.

Here’s a by-the-numbers look at the laundry list of achievements during the summer flight season, which began June 4 and ended this week (Aug. 17):

        99.79 percent: A summer schedule mainline "completion factor" record. Previous record was 99.74 percent set last year. Completion factor means days without a canceled flight.

        21: The record number of 100 percent mainline Delta system completion factor days in a summer schedule. Previous was 16 days, set last year.

        139.2 hours: Longest streak of consecutive hours without a cancellation during a summer schedule, which ran from the evening of June 25 through the afternoon of July 1. That shattered the previous record of 80.3 hours set in June 2014.

        3,202 flights: The record number of mainline Delta departures made in a single day, which was set at the end of the grueling schedule: on Aug. 17.

        614,159: Number of passengers enplaned in a single day across the system, including Delta Connection flights, set on July 31.

        96.72 percent: Record on-time departure performance driven by Delta Technical Operations. The previous high of 96.69 percent was set last year.

        99.97 percent: Record maintenance completion factor. Put another way, only 0.03 percent of mainline scheduled operations this summer occurred due to a maintenance reason. Previous high of 99.96 percent was set in 2014.

        45 days: Record number of days this summer without any maintenance cancelations. Previous record was 26 in 2014.

These records are particularly noteworthy because of the heavier workload this summer. Consider:

  •         Total daily mainline flights were up nearly 10 percent compared to last summer, averaging 3,043 daily departures.
  •         Mainline arrivals exactly on-time or early were up 1.27 percentage points compared to last summer even with the higher volume.
  •         Delta Connection reliability finished strong. Across flights operated by Delta’s six regional partners during the summer, more than 1,600 fewer cancelations were incurred compared to last year.