Efforts to contain the 2019 novel coronavirus disease (COVID-19) have dramatically changed global commercial passenger flight volumes. These flights averaged a little more than 70,000 flights per day in January and February, fell to an average of less than 25,000 flights per day in April, and then started to increase again in May. Commercial jet fuel consumption showed a similar pattern, falling from an average of 4.3 million barrels per day (b/d) in January and February to 1.0 million b/d in April.