Aviation went through something of a 'golden decade' in the ten years up to 2020. Growth in passenger traffic averaged more than 6% per year.
The passenger load factor - the proportion of seats occupied on the aircraft - hit an all time high in 2019, even though planes were getting bigger and had more seats to fill.
As 2020 rolled around, the sector was looking back at a bumper era for air travel, but the future was less certain with cracks already starting to show.
Boeing was forced to ground its MAX 737 aircraft in 2019 following two fatal crashes, and the era of 'flygskam' - or 'flight shaming' - on environmental grounds had arrived.