Based on flight delay data from 2015 some correlations can be shown.[14] The analysis focuses on America's ten biggest airports, those are; Atlanta, Chicago, Dallas, Denver, New York (JFK), Los Angeles, San Francisco, Las Vegas, Seattle and Charlotte. Data analysis confirms that the distribution of delays at departure is very similar to that at arrival and there is a strong correlation between the two data. Observed is namely the average time of delay per month and the tendency of delays depending on the days of the week.