| | | | March | April | May | June | July | August | Total | | Air Carrier Delay | | Number of Delays | 36,034 | 34,432 | 45,560 | 48,494 | 59,376 | 44,296 | 268,193 | | % of Total Operations | 6.09% | 5.91% | 7.47% | 7.94% | 9.36% | 7.16% | 7.35% | | Delayed Minutes | 2,735,376 | 2,537,517 | 3,616,774 | 3,791,702 | 5,359,142 | 3,585,735 | 21,626,246 | | % of Total Operations | 32.11% | 33.57% | 29.84% | 34.43% | 36.58% | 33.80% | 33.54% | | Aircraft Arriving Late | | Number of Delays | 46,189 | 40,858 | 61,429 | 58,698 | 73,147 | 52,693 | 333,013 | | % of Total Operations | 7.81% | 7.02% | 10.07% | 9.60% | 11.53% | 8.51% | 9.13% | | Delayed Minutes | 3,583,293 | 3,102,075 | 5,206,863 | 4,574,139 | 6,251,675 | 4,217,769 | 26,935,814 | | % of Total Operations | 42.07% | 41.04% | 42.95% | 41.53% | 42.67% | 39.76% | 41.78% | | Security Delay | | Number of Delays | 385 | 346 | 347 | 432 | 445 | 329 | 2,284 | | % of Total Operations | 0.07% | 0.06% | 0.06% | 0.07% | 0.07% | 0.05% | 0.06% | | Delayed Minutes | 17,710 | 15,524 | 16,841 | 19,284 | 20,769 | 14,678 | 104,806 | | % of Total Operations | 0.21% | 0.21% | 0.14% | 0.18% | 0.14% | 0.14% | 0.16% | | National Aviation System Delay | | Number of Delays | 36,120 | 30,869 | 43,805 | 36,332 | 42,025 | 38,775 | 227,927 | | % of Total Operations | 6.10% | 5.30% | 7.18% | 5.95% | 6.62% | 6.26% | 6.25% | | Delayed Minutes | 1,823,287 | 1,515,097 | 2,431,890 | 1,962,864 | 2,350,493 | 2,163,238 | 12,246,869 | | % of Total Operations | 21.41% | 20.05% | 20.06% | 17.82% | 16.04% | 20.39% | 19.00% | | Extreme Weather | | Number of Delays | 3,305 | 3,442 | 7,135 | 5,989 | 6,869 | 5,720 | 32,460 | | % of Total Operations | 0.56% | 0.59% | 1.17% | 0.98% | 1.08% | 0.92% | 0.89% | | Delayed Minutes | 357,961 | 388,236 | 849,711 | 665,955 | 669,842 | 627,944 | 3,559,649 | | % of Total Operations | 4.20% | 5.14% | 7.01% | 6.05% | 4.57% | 5.92% | 5.52% |
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| A flight is considered delayed when it arrived 15 or more minutes than the schedule (see definitions in Frequently Asked Questions). Delayed minutes are calculated for delayed flights only.
When multiple causes are assigned to one delayed flight, each cause is prorated based on delayed minutes it is responsible for. The displayed numbers are rounded and may not add up to the total.
SOURCE: Bureau of Transportation Statistics, Airline Service Quality Performance 234 | | More Topics: | | Ontime Arrival Performance | | Weather's Share of Delayed Flights | | Weather's Share of National Aviation System (NAS) Delays | | National Aviation System (NAS) Delay by Cause | |
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