Likely because there are very few flights between midnight and 6AM. This is because many cities have regulations on flights at early morning hours due to the no

Likely because there are very few flights between midnight and 6AM. This is because many cities have regulations on flights at early morning hours due to the noise generated. Recently I did a similar project, except I chose to only look at flights from JFK to LAX (also only for 2013). I was looking more widely at flight time and what affects flight time. Despite these differences, I did come up with fairly similar data. http://daviddworken.com/varianceInFlightTimeJFKtoLAX-2013.pdf http://daviddworken.com/varianceInFlightTimeJFKtoLAX-2013.pd... In my analysis I included the midnight to 6 am data on the chart, even though I had a grand total of 32 data points for that section.