Airlines across the globe are grounding their fleets of aircraft as a result of the current fall in demand. United Airlines has 91 Boeing 777s in its fleet, according to the latest data from FlightRadar24.com.

However, how many of these 777s are still flying, and where are the grounded aircraft parked? Simple Flying dug through the data so that you don't have to. Here's what we found out!

74% grounded

To determine how many of United Airlines' Boeing 777s are grounded, we looked at the date that each of the aircraft took its last flight. For this article, we've defined a plane that hasn't flown for the past five days as being grounded.

When were the aircraft grounded?

United Airline's first Boeing 777 to be grounded last flew to Xiamen on the 28th of February, most likely for heavy maintenance. Since then, two other Boeing 777s have flown out to Xiamen.

It seems that United Airlines began grounding aircraft due to the current situation on the 15th of March in mid-March. While other airlines have grounded many aircraft at once, United Airlines has been grounding its 777s at a reasonably steady rate.

Around half of the United Airlines Boeing 777 fleet had been grounded as of the start of April. However, as of 5 days ago, just 24 of the airline's Boeing 777s remained up in the skies.

So, where are the aircraft grounded?

Unsurprisingly, a large number of the airline's 777s are parked up in the United States. It seems as though the only ones out of the country are being maintained. Three of the airline's 777s are in Xiamen, China. Simple Flying believes these aircraft are undergoing heavy maintenance. Additionally, three aircraft are in Hong Kong, where United is retrofitting aircraft with the Polaris business class seat.

61 of the aircraft remain in the United States. 16 have been flown out to an Aircraft graveyard in New Mexico, Roswell (ROW). The remaining planes are parked up at major airports across the United States. 13 are at Dulles Airport (IAD), 12 are at Chicago's O'Hare airport (ORD), with nine in Houston (IAH).

Finally, San Francisco (SFO) has six aircraft, while Denver (DEN) and Los Angeles (LAX) each have two. Finally, there is one Boeing 777 grounded at New York's Newark Airport (EWR). Of course, it is always possible that more aircraft could be grounded temporarily before the situation begins to improve.

Have you flown on a United Airlines Boeing 777? Let us know your favorite memory of the time in the comments!