The term "busiest routes" refers to the most heavily traveled or crowded paths that people take when they are traveling from one place to another. Full definition
Even as a Global Service member I would have up to 8 paid upgrades in front of me, making it very unlikely for lower - level members to score an upgrade on busy routes or days. (dreamtravelonpoints.com)
Carrying passengers along busy routes in larger aircraft to allow the lowering of frequency along that route would do far more to reduce carbon emissions than simply flying in a slightly more efficient way. (environmentalleader.com)
Regardless, only about 72 per cent of WestJet's flights on its top 20 busiest routes landed on time over the past three months, according to FlightStats. (macleans.ca)