Date,Flights not arriving on-time (percent),Flights arriving on-time (percent)
Sep-87,22.91,
Oct-87,19.61, 80.39 
Nov-87,23.84, 76.16 
Dec-87,33.49, 66.51 
Jan-88,30.65, 69.35 
Feb-88,25.24, 74.76 
Mar-88,21.10, 78.90 
Apr-88,17.33, 82.67 
May-88,18.03, 81.97 
Jun-88,15.62, 84.38 
Jul-88,18.46, 81.54 
Aug-88,17.04, 82.96 
Sep-88,14.37, 85.63 
Oct-88,16.60, 83.40 
Nov-88,22.34, 77.66 
Dec-88,23.86, 76.14 
Jan-89,23.32, 76.68 
Feb-89,27.58, 72.42 
Mar-89,30.38, 69.62 
Apr-89,16.61, 83.39 
May-89,20.54, 79.46 
Jun-89,27.82, 72.18 
Jul-89,23.13, 76.87 
Aug-89,25.37, 74.63 
Sep-89,20.39, 79.61 
Oct-89,20.54, 79.46 
Nov-89,21.98, 78.02 
Dec-89,29.80, 70.20 
Jan-90,22.40, 77.60 
Feb-90,26.78, 73.22 
Mar-90,23.46, 76.54 
Apr-90,17.79, 82.21 
May-90,19.16, 80.84 
Jun-90,19.94, 80.06 
Jul-90,18.94, 81.06 
Aug-90,21.46, 78.54 
Sep-90,15.59, 84.41 
Oct-90,17.58, 82.42 
Nov-90,15.43, 84.57 
Dec-90,29.70, 70.30 
Jan-91,26.17, 73.83 
Feb-91,18.15, 81.85 
Mar-91,19.99, 80.01 
Apr-91,16.62, 83.38 
May-91,16.50, 83.50 
Jun-91,14.72, 85.28 
Jul-91,15.51, 84.49 
Aug-91,16.73, 83.27 
Sep-91,12.10, 87.90 
Oct-91,16.61, 83.39 
Nov-91,17.28, 82.72 
Dec-91,20.04, 79.96 
Jan-92,18.61, 81.39 
Feb-92,16.57, 83.43 
Mar-92,19.10, 80.90 
Apr-92,13.40, 86.60 
May-92,13.45, 86.55 
Jun-92,18.96, 81.04 
Jul-92,20.22, 79.78 
Aug-92,19.66, 80.34 
Sep-92,14.81, 85.19 
Oct-92,14.19, 85.81 
Nov-92,17.32, 82.68 
Dec-92,26.11, 73.89 
Jan-93,22.37, 77.63 
Feb-93,23.15, 76.85 
Mar-93,26.39, 73.61 
Apr-93,17.08, 82.92 
May-93,12.89, 87.11 
Jun-93,16.75, 83.25 
Jul-93,13.94, 86.06 
Aug-93,15.88, 84.12 
Sep-93,15.37, 84.63 
Oct-93,16.96, 83.04 
Nov-93,18.82, 81.18 
Dec-93,21.39, 78.61 
Jan-94,29.53, 70.47 
Feb-94,26.17, 73.83 
Mar-94,17.44, 82.56 
Apr-94,16.97, 83.03 
May-94,12.37, 87.63 
Jun-94,18.23, 81.77 
Jul-94,20.55, 79.45 
Aug-94,16.25, 83.75 
Sep-94,12.05, 87.95 
Oct-94,14.07, 85.93 
Nov-94,19.25, 80.75 
Dec-94,20.75, 79.25 
Jan-95,26.17, 73.83 
Feb-95,21.09, 78.91 
Mar-95,20.70, 79.30 
Apr-95,18.70, 81.30 
May-95,19.32, 80.68 
Jun-95,24.06, 75.94 
Jul-95,19.92, 80.08 
Aug-95,20.15, 79.85 
Sep-95,14.42, 85.58 
Oct-95,17.91, 82.09 
Nov-95,22.15, 77.85 
Dec-95,32.34, 67.66 
Jan-96,37.33, 62.67 
Feb-96,28.10, 71.90 
Mar-96,24.06, 75.94 
Apr-96,19.82, 80.18 
May-96,21.08, 78.92 
Jun-96,25.33, 74.67 
Jul-96,24.71, 75.29 
Aug-96,25.31, 74.69 
Sep-96,21.31, 78.69 
Oct-96,22.81, 77.19 
Nov-96,22.09, 77.91 
Dec-96,33.37, 66.63 
Jan-97,31.59, 68.41 
Feb-97,24.79, 75.21 
Mar-97,21.90, 78.10 
Apr-97,20.15, 79.85 
May-97,16.84, 83.16 
Jun-97,23.86, 76.14 
Jul-97,22.50, 77.50 
Aug-97,21.44, 78.56 
Sep-97,14.97, 85.03 
Oct-97,18.45, 81.55 
Nov-97,21.78, 78.22 
Dec-97,26.46, 73.54 
Jan-98,24.95, 75.05 
Feb-98,24.61, 75.39 
Mar-98,24.15, 75.85 
Apr-98,20.88, 79.12 
May-98,22.52, 77.48 
Jun-98,29.58, 70.42 
Jul-98,21.14, 78.86 
Aug-98,22.97, 77.03 
Sep-98,21.06, 78.94 
Oct-98,18.25, 81.75 
Nov-98,16.71, 83.29 
Dec-98,26.78, 73.22 
Jan-99,32.34, 67.66 
Feb-99,21.09, 78.91 
Mar-99,21.91, 78.09 
Apr-99,24.27, 75.73 
May-99,23.81, 76.19 
Jun-99,29.12, 70.88 
Jul-99,28.93, 71.07 
Aug-99,23.89, 76.11 
Sep-99,20.65, 79.35 
Oct-99,19.94, 80.06 
Nov-99,18.59, 81.41 
Dec-99,22.00, 78.00 
Jan-00,26.25, 73.75 
Feb-00,25.24, 74.76 
Mar-00,23.01, 76.99 
Apr-00,24.63, 75.37 
May-00,25.75, 74.25 
Jun-00,33.66, 66.34 
Jul-00,29.69, 70.31 
Aug-00,30.04, 69.96 
Sep-00,21.90, 78.10 
Oct-00,23.93, 76.07 
Nov-00,27.18, 72.82 
Dec-00,37.25, 62.75 
Jan-01,24.58, 75.42 
Feb-01,27.27, 72.73 
Mar-01,24.78, 75.22 
Apr-01,20.71, 79.29 
May-01,18.53, 81.47 
Jun-01,24.82, 75.18 
Jul-01,21.88, 78.12 
Aug-01,23.82, 76.18 
Sep-01,32.34, 67.66 
Oct-01,15.22, 84.78 
Nov-01,15.29, 84.71 
Dec-01,19.78, 80.22 
Jan-02,18.98, 81.02 
Feb-02,15.31, 84.69 
Mar-02,21.41, 78.59 
Apr-02,17.42, 82.58 
May-02,17.24, 82.76 
Jun-02,21.36, 78.64 
Jul-02,20.34, 79.66 
Aug-02,17.38, 82.62 
Sep-02,12.05, 87.95 
Oct-02,15.82, 84.18 
Nov-02,14.79, 85.21 
Dec-02,21.66, 78.34 
Jan-03,16.68, 83.32 
Feb-03,23.46, 76.54 
Mar-03,17.42, 82.58 
Apr-03,13.15, 86.85 
May-03,15.07, 84.93 
Jun-03,17.64, 82.36 
Jul-03,20.34, 79.66 
Aug-03,21.00, 79.00 
Sep-03,14.37, 85.63 
Oct-03,13.61, 86.39 
Nov-03,19.80, 80.20 
Dec-03,23.96, 76.04 
Jan-04,25.15, 74.85 
Feb-04,22.52, 77.48 
Mar-04,18.71, 81.29 
Apr-04,16.96, 83.04 
May-04,22.38, 77.62 
Jun-04,27.05, 72.95 
Jul-04,24.05, 75.95 
Aug-04,21.71, 78.29 
Sep-04,16.09, 83.91 
Oct-04,19.00, 81.00 
Nov-04,20.88, 79.12 
Dec-04,28.44, 71.56 
Jan-05,28.61, 71.39 
Feb-05,22.42, 77.58 
Mar-05,23.06, 76.94 
Apr-05,16.56, 83.44 
May-05,16.33, 83.67 
Jun-05,24.80, 75.20 
Jul-05,29.08, 70.92 
Aug-05,24.84, 75.16 
Sep-05,17.34, 82.66 
Oct-05,18.74, 81.26 
Nov-05,19.97, 80.03 
Dec-05,28.99, 71.01 
Jan-06,21.24, 78.76 
Feb-06,24.70, 75.30 
Mar-06,23.88, 76.12 
Apr-06,21.58, 78.42 
May-06,21.73, 78.27 
Jun-06,27.17, 72.83 
Jul-06,26.30, 73.70 
Aug-06,24.20, 75.80 
Sep-06,23.78, 76.22