After an unprecedented drop in air travel because of the coronavirus, passenger airlines are being forced to make long-term, make-or-break decisions at a time of great uncertainty and minimal cash flow. So how are they planning to survive? WSJ finds out. Composite: George Downs/The Wall Street Journal Thousands of airline workers could lose their jobs this week if lawmakers are unable to get closer to resolving disputes that have stymied negotiations over broad coronavirus relief for months. Airlines agreed last spring not to lay off or furlough any workers until Oct. 1 as a condition of a $25 billion infusion of federal aid. Now, barring a last-minute agreement on how much to spend on a pandemic relief package for the country, more than 30,000 airline workers are set to be furloughed Thursday. House…