Commercial flights were allowed to fly any course to their destination and would often detour over points of interest. This ended in 1956 when two planes crashed mid-flight over the Grand Canyon.
The world’s busiest air route is between Seoul and Jeju Island.
Dead passengers on British Airways flights used to be given sunglasses, a vodka and tonic and a copy of the Daily Mail to disguise them from other passengers.
When three-letter airport codes became standard, many airports that had been using two letters simply added an “X”.