These Were the Top 5 Most Disrupted Airline Routes in 2017. Here’s What to Consider in 2019. Posted byHenrik Hillmer January 3, 2019 Leave a comment on These Were the Top 5 Most Disrupted Airline Routes in 2017. Here’s What to Consider in 2019. Quick tip: The best time to catch an on-time flight when departing the top five busiest U.S. airports is between 6 a.m. and 12 p.m