This line chart depicts each cause of airlines delay over the time period of 2004 to 2015. It can be clearly seen that airlines delays were highest in the year 2007 and lowest in the year 2012. National Aviation System (NAS) is the prime cause for flights delay and Security is the inferior cause for flights delay.

Airlines delays were highest in the months of June, July and December. Airlines delays were lowest in the months of September and November.