Virgin Australia entered voluntary administration, the Australian equivalent of chapter 11 bankruptcy, on Tuesday, April 21.Although the Brisbane-based airline had suspended most of its operations and furloughed most of its employees, it was still losing money operating about 65 daily flights. The airline said it would continue operating during the restructuring process. It entered administration after a request for aid from the Australian government was denied.Compass Airlines — also owned by Trans States Holdings — will also shut down in April.Compass is another regional carrier, which operates flights for American Airlines under its American Eagle brand. With American cutting domestic capacity by up to 80% by May, it's had less of a need for contract airlines.Trans States Airlines is a Missouri-based regional airline that flies routes for United under the United Express brand.The airline had already been planning to shut down by the end of 2020, consolidating its operations with ExpressJet Airlines, another of United's regional carrier.However, due to the unforeseen impact of the coronavirus, the airline will cease all operations on April 1, Trans States Holding CEO said in a memo to employees.Trans States operated a flight of Embraer ERJ-145 regional jets.UK regional airline Flybe entered administration — a practice similar to declaring bankruptcy — on Thursday, March 5. Although Flybe was already on the brink of collapse — despite a major investment by a Virgin Atlantic-led consortium the previous summer — the coronavirus crisis pushed it over the edge. Flybe operated about 40% of domestic flights in the UK.