TULSA, Okla. (AP) — A report by a Denver-based airline consulting firm says commercial flights from Tulsa International Airport are among the most expensive in the nation on a mile-per-mile basis.

The report by Boyd Group International Inc. said flying from Tulsa’s airport is the sixth most expensive among the nation’s 100 largest airports, at a cost of 21.1 cents per mile. That trails only the 24.3 cents per mile cost at Dallas’ Love airport; 22.1 cents per mile at the Memphis, Tenn., airport; 22 cents at Cincinnati-Northern Kentucky; 21.6 cents at Houston Intercontinental; and Cleveland’s 21.3 cents per mile.