The chart below shows the average delay in flight departures (in minutes) at different airports in the USA for five different time periods. Summarise the information by selecting and reporting the main features, and make comparisons where relevant.

The bar chart provides information on flights which was delayed at four separate airports in the United States for multiple timeframes. Overall, the proportion of on-time departures in all airports decreased after hitting its highest point between 2001 and 2005, except for San Francisco airport where the amount of delayed flights from 2006 to 2010 […]