OST_R | BTS | Transtats

Month	Ontime Departures	Ontime (%)	Departure Delays	Delayed (%)	Flights Cancelled	Cancelled (%)	Diverted	Flight Operations
January	2,436	73.00%	767	22.98%	134	4.02%	N/A	3,337
February	2,353	77.76%	613	20.26%	60	1.98%	N/A	3,026
March	2,880	78.62%	746	20.37%	37	1.01%	N/A	3,663
April	2,773	78.18%	755	21.29%	19	0.54%	N/A	3,547
May	2,836	76.07%	842	22.59%	50	1.34%	N/A	3,728
June	2,788	73.76%	956	25.29%	36	0.95%	N/A	3,780
July	2,996	76.37%	892	22.74%	35	0.89%	N/A	3,923
August	3,071	82.13%	642	17.17%	26	0.70%	N/A	3,739
September	3,078	85.31%	503	13.94%	27	0.75%	N/A	3,608
October	3,210	84.97%	546	14.45%	22	0.58%	N/A	3,778
November	2,854	83.33%	555	16.20%	16	0.47%	N/A	3,425
December	2,810	79.29%	712	20.09%	22	0.62%	N/A	3,544
--------	--------	--------	--------	--------	--------	--------	--------	--------
2014 (Annual)	34,085	79.09%	8,529	19.79%	484	1.12%	N/A	43,098

* For purposes of this report, a flight is considered delayed if it arrived at (or departed) the gate 15 minutes or more after the scheduled arrival (departure) time as reflected in the Computerized Reservation System.
** The information is based on data submitted by reporting carriers. The number of reporting carriers varies as follows: 14 from 1987 to 1988, 13 in 1989, 12 from 1990 to 1991, 10 from 1992 to 1999, 11 in 2000, 12 in 2001, 10 in 2002, 18 in 2003, 19 in 2004, 20 from 2005 to 2008, 19 in 2009, 18 in 2010, 16 in 2011, 15 in 2012, 16 in 2013, 14 in 2014, 14 in 2015, 12 in 2016, 12 in 2017, 18 in 2018, 17 in 2019, 17 in 2020, 17 in 2021. (See Reporting Carriers by Year). In the dropdown list, All Major Carriers 1987-Present refers to the 10 major carriers that reported for all years or merged into another major carrier. They are Alaska Airlines, America West (merged into US Airways starting January 2006), American Airlines, Continental Airlines (merged into United Airlines starting January 2012), Delta Air Lines, Northwest Airlines (merged into Delta Air Lines starting January 2010), Southwest Airlines, Trans World Airways (merged into American Airlines starting January 2002), United Airlines, and US Airways (merged into American Airlines starting July 2015).

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