Aviation improves and advances every year. Costs get lower, tickets get cheaper, people travel more. But then a crisis comes along and throws the whole market into turmoil.

The 2020 crisis, caused by the COVID-19 pandemic, was not an exception. Air traffic and revenue fell and for several months it looked like the whole world stopped. Now when the year is over, we can look back, count the results, and see where the industry is. How far back was it pushed? To what year various numeral results of 2020 can be compared to?