Or Frontier doing LAX-MSP, which NW responded to by smothering that route with DC10s and sucking up all F9s pax with ridiculously low fares (I recall $49, this was in 2002-03 or so). They did the same to airtran when they tried some direct flying out of MSP. But Reno, airtran & Frontier went up against Northwest. NWA was always the most aggressive in defending their hubs, to the point of being accused of anti-competitive behavior, and was especially protective of MSP. They tolerated Sun Country as a way of keeping all the other LCCs out. Delta's always been a lot more laissez-faire about competition even in their core hubs, and MSP certainly isn't one of those anymore.