I think you need to exclude months or weeks with zero flights, otherwise you get bad data for seasonal routes. For instance, look at this one: http://flightsph

I think you need to exclude months or weeks with zero flights, otherwise you get bad data for seasonal routes. For instance, look at this one: http://flightsphere.com/flight-time/from/hartford/to/las-vegas http://flightsphere.com/flight-time/from/hartford/to/las-veg... It's clearly a daily flight, based on the per-day chart, but it says it is 5 days a week, because they don't run it year-round.