American Airlines famously killed upstart after upstart that attempted to fly out of Dallas Love Field. They kept a lease on two gates, but left them unused almost all of the time (AA generally flies out of the larger Dallas-Fort Worth International Airport). Whenever any new company tried to start new service out of Love field, American would open those two gates, match routes exactly to the startup, and charge substantially less, clearly incurring a loss for each plane flown. As soon as the new company was driven into bankruptcy, AA would again shutter those gates, leaving them available to crush the next company that tried to start at Love Field. See, e.g., Legend Airlines.