Don't think it's even that. All they had to do was match or get close to Spirts fares until they drove them out of business. The major carriers don't need to co

Don't think it's even that. All they had to do was match or get close to Spirts fares until they drove them out of business. The major carriers don't need to collude, it's part of their playbook and apparent when they go after a route or market. AA, Delta, and United could afford to lose money on routes longer than Spirit could. It's a shame if Spirit doesn't make it.