It's not just the fleet types but also which region each company primarily operates in and especially what hub each primarily uses. Anyone spending most of the time in New York is going to take it in the rear with D0 A0 and A14 and many days to catch back up will have to dump an entire bank at the cost of the Completion factor. Working out of SLC with little bad weather to deal with or DTW with the capacity (though it's begun to get MUCH worse with the new Delta scheduling) can greatly help numbers. Heck anyone in CVG should be near 100% on everything with it becoming the new ghost town...