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May 2011 Regularly Scheduled Flights with More than 50% Delayed Arrivals of More than 30 Minutes

RankCarrierFlight NumberMonthOrigin-DestScheduled Departure TimeNumber of Operations (minimum of 10 per month)Number of Flight Operations Not Arriving On-Time*Percent of Flight Operations Not Arriving On-Time*Average Number of Minutes of Delay (30 min late flights only)**
1Frontier804MayMCI-LGA1810161381.2593
2American Eagle3841MayBOS-JFK1830312374.1971
3Continental264MayORD-EWR1800272074.07100
4Continental281MayORD-EWR1900272074.0775
5American614MayDFW-BOS1735261869.23107
6American Eagle3605MayORD-BDL2150271866.6770
7American Eagle3870MayORD-CMH2105271866.67181
8American Eagle4115MayORD-MKE1800271866.6760
9Southwest3233MayMDW-BOS1600271866.67105
10Southwest2894MayMDW-LGA1850271866.67100
11Southwest2636MayBWI-ISP2050261765.3883
12American2374MayDFW-ORD2035171164.7170
13American Eagle3835MayDCA-JFK1825312064.5269
14American Eagle3740MayORD-EWR1600312064.5268
15Southwest282MayEWR-MDW1755312064.52107
16Atlantic Southeast4978MayDCA-BOS1700251664.00107
17American738MayDFW-LGA1520221463.6483
18United896MayORD-BOS1735221463.64104
19Atlantic Southeast4979MayMEM-DFW1945301963.33102
20American403MayDFW-TUS2220271762.9691
21Southwest672MaySLC-LAS1930271762.9669
22ExpressJet2203MayDTW-EWR2011241562.5096
23ExpressJet2816MayEWR-MSY2045161062.50114
24JetBlue958MayMCO-BOS1815241562.5097
25Atlantic Southeast5080MayBOS-IND1915261661.5490
26ExpressJet2741MayCVG-EWR1830261661.54105
27ExpressJet2248MayMEM-EWR1900261661.5485
28Southwest672MayLAS-PDX2025261661.5463
29American2356MayORD-EWR1825311961.29120
30American Eagle3812MayJFK-BOS1630311961.2991
31American Eagle3919MayLIT-ORD1505311961.29126
32Southwest173MayMDW-EWR1420311961.2988
33US Airways1232MayCLT-BOS1950311961.2979
34American154MayORD-BOS1720301860.0096
35Atlantic Southeast5143MayATL-VPS163010660.0071
36ExpressJet2774MayDAY-EWR1832251560.00103
37American1184MayORD-EWR1215271659.2676
38Atlantic Southeast5753MayIAD-LGA1715271659.2696
39Atlantic Southeast5734MayLGA-IAD1923271659.2696
40JetBlue926MayORD-BOS1945271659.26105
41AirTran821MayBWI-BOS1735221359.09119
42United696MayORD-LGA1900221359.0995
43JetBlue1179MayBOS-EWR1820241458.3397
44JetBlue927MayBOS-ORD195512758.33126
45American1869MayORD-STL2105311858.0683
46American Eagle3855MayORD-JFK1600311858.0696
47ExpressJet2714MayBWI-EWR1651311858.06106
48Frontier516MayDEN-LGA1514311858.0694
49Southwest222MayMDW-EWR1620311858.06105
50Atlantic Southeast4981MayBOS-DCA1915261557.6979
51ExpressJet3084MayCLE-LGA1659261557.69111
52ExpressJet2747MayEWR-BNA2050261557.6985
53ExpressJet2264MayIND-EWR1730261557.69107
54Southwest2625MayBWI-BDL2110261557.69120
55Southwest667MayBWI-BUF2050261557.6957
56Southwest50MayDAL-MCI1950261557.69136
57Southwest325MayHOU-CRP2035261557.6997
58Southwest796MayMDW-BOS2030261557.6974
59United436MayORD-EWR1500261557.6977
60ExpressJet5822MayBNA-ORD1840211257.14109
61ExpressJet5822MayORD-BNA1638211257.1472
62JetBlue1017MayBOS-JFK1850281657.14106
63American350MayORD-LGA1755301756.6780
64Atlantic Southeast5190MayHOU-ATL1600301756.67125
65ExpressJet2516MayROC-EWR1516231356.5282
66ExpressJet2283MayIAH-CID195016956.2559
67ExpressJet3073MayGRR-EWR1910251456.0094
68JetBlue918MayORD-JFK1835251456.00129
69American1105MayDCA-DFW2005271555.5682
70American1548MayDFW-DCA1525271555.5688
71American1677MayORD-SNA1845271555.5650
72American Eagle3962MayMKE-ORD1915271555.5665
73American Eagle3945MayORD-PIT2140271555.5663
74American Eagle3850MayORD-XNA2000271555.5681
75Atlantic Southeast5009MayIND-BOS1820271555.5692
76Continental256MayORD-EWR1700271555.5695
77ExpressJet6107MayIAD-MHT1715181055.5693
78ExpressJet3046MayMEM-EWR1219271555.5692
79Mesa3757MayORD-CLT1905271555.5683
80Southwest3320MayBOS-MDW1950271555.56109
81Southwest327MayBWI-BOS2050271555.5677
82Southwest176MayBWI-GSP1955271555.5672
83Southwest782MayDAL-LBB2025271555.5685
84Southwest672MayDEN-SLC1740271555.5670
85Southwest217MayEWR-MDW1955271555.56134
86Southwest117MayHOU-OKC2005271555.56100
87US Airways1893MayPIT-PHL1745271555.5661
88American1183MayIAD-DFW1950291655.17114
89United836MayORD-BOS1846291655.1798
90American1183MayDFW-OKC2255311754.8472
91American2356MayDFW-ORD1510311754.84108
92American515MayDFW-SFO1740311754.8486
93American874MayORD-BOS1910311754.8488
94American Eagle3777MayJFK-ORD1620311754.84112
95American Eagle3703MayORD-ATL1725311754.8488
96American Eagle4374MayORD-CMI1815311754.8480
97American Eagle4357MayORD-GRB1725311754.8475
98American Eagle4047MayORD-RIC1625311754.8492
99Atlantic Southeast5183MayATL-HOU1620311754.8450
100Southwest216MayEWR-STL1625311754.8499
101Southwest36MayHOU-DAL1500311754.8491
102Southwest1568MayLAS-LAX1940311754.8469
103Southwest257MayMDW-EWR1250311754.8479
104United502MayORD-LGA1800311754.84105
105US Airways967MayPHL-SFO1800311754.8474
106AirTran357MayLGA-ATL1859221254.5587
107American1940MayORD-MIA1940221254.55104
108Atlantic Southeast5365MayATL-HPN1610221254.5580
109ExpressJet6082MayORD-CID144411654.55113
110ExpressJet2019MaySTL-EWR1656221254.55104
111ExpressJet2533MayDTW-EWR1716241354.17128
112ExpressJet2548MayEWR-DTW1738241354.17106
113Atlantic Southeast4980MayDCA-BOS1900261453.85110
114Atlantic Southeast5325MayDCA-JAN1930261453.8587
115Continental1526MayORD-EWR2000261453.85107
116ExpressJet2522MayCLE-BOS1855261453.85117
117ExpressJet2594MayEWR-DTW2000261453.8584
118ExpressJet2379MayEWR-SDF2050261453.8585
119ExpressJet2717MayEWR-STL2100261453.8594
120ExpressJet6006MayIAD-DAY220513753.8554
121ExpressJet2298MayIND-EWR1915261453.8579
122ExpressJet2505MayRIC-EWR1712261453.8596
123ExpressJet2808MayXNA-EWR1842261453.8596
124Southwest971MayBWI-ALB2050261453.8551
125Atlantic Southeast5145MayATL-HOU1945281553.57113
126JetBlue924MayORD-BOS1600281553.57123
127American857MayRDU-ORD1750301653.3377
128American Eagle3745MayORD-PHL1545301653.33108
129United882MayORD-BOS1614301653.33138
130Delta1623MayBOS-DTW1820191052.63105
131Frontier436MayDEN-OMA1555191052.6356
132ExpressJet5874MayCID-ORD1911211152.3868
133American Eagle4353MayORD-CLE2005231252.1781
134JetBlue1016MayJFK-BOS2100231252.1785
135ExpressJet5930MayIAD-SDF1740251352.00110
136United676MayORD-LGA1000251352.00104
137American1072MayDFW-PHL1925271451.8581
138American2491MayORD-AUS2010271451.8580
139American348MayORD-LGA1855271451.8555
140American Eagle4157MayBNA-ORD1840271451.8571
141American Eagle4254MayORD-AVP1850271451.8576
142American Eagle4308MayORD-BNA2030271451.8554
143American Eagle3918MayORD-DAY2200271451.8560
144American Eagle3924MayTUL-ORD2000271451.8591
145Continental847MayEWR-ORD1700271451.8581
146Southwest855MayBOS-BWI1915271451.85124
147Southwest37MayHOU-PHL1705271451.85165
148Southwest1549MayMDW-LGA2040271451.8564
149Southwest855MayPHL-BOS1725271451.85129
150United690MayORD-LGA1700271451.85101
151US Airways983MayORD-CLT1746271451.8582
152Southwest1924MayLAX-SMF2045291551.7254
153United384MayIAD-SLC1735291551.7291
154American409MayDCA-DFW1845311651.6175
155American1016MayDFW-BOS1600311651.6178
156American1156MayDFW-DCA1405311651.6170
157American558MayDFW-EWR1135311651.6175
158American848MayDFW-EWR1900311651.61100
159American2368MayDFW-ORD1815311651.6176
160American1019MayDFW-SEA1845311651.6190
161American1515MayJFK-MCO1940311651.6192
162American Eagle4221MayGRB-ORD1850311651.6182
163American Eagle4358MayIND-JFK1720311651.6196
164American Eagle3846MayJFK-DCA2100311651.6182
165American Eagle4305MayJFK-IND2030311651.61116
166American Eagle4218MayJFK-PIT2030311651.6183
167American Eagle3864MayORD-ABQ1935311651.6180
168American Eagle4261MayTUL-ORD1410311651.6167
169Atlantic Southeast5341MayDTW-EWR1745311651.61110
170Atlantic Southeast4989MayMEM-BOS1414311651.61105
171Southwest1146MayBWI-BOS1825311651.6183
172United223MayIAD-BOS1651311651.61130
173US Airways1400MayBOS-CLT1700311651.6163
174US Airways1770MayCLT-BOS1420311651.6160
175US Airways1488MayCLT-BOS1610311651.6175
176US Airways1774MayCLT-DTW2215311651.6160
177US Airways707MayPHL-ORD1800311651.61105
Notes: 

* Includes canceled and diverted flights

** For flights late more than 30 minutes only.  Excludes canceled and diverted flights

Source: 

Bureau of Transportation Statistics, Airline On-Time Data