The on-time performance of Delta Air Lines' regional carriers may get a boost by default. Delta's regional subsidiary Comair has shrunk to a size so small that it is no longer required to report its statistics for on-time flights to the federal government.

For the year through August, Erlanger, Ky.-based Comair had the worst on-time performance among the 18 carriers ranked by the U.S. Bureau of Transportation Statistics, with 71.8 percent of its flights arriving on time.

Carriers with revenue higher than 1 percent of the airline industry's domestic passenger revenue are required to report their on-time performance. But starting in 2011, Comair will no longer be required to report the statistics, according to the BTS.

Comair will not be reporting the data, but "remains committed to running the best operation possible," according to a statement from Comair spokeswoman Christine Wever.

Meanwhile, one of Delta's regional partners, Pinnacle Airlines, will stop voluntarily reporting its on-time statistics, according to the BTS. Delta and other regional carriers, including Atlanta-based Atlantic Southeast Airlines, will continue to report their on-time statistics.

Comair continues to make cuts, as Delta cuts back on the regional carrier's operations, particularly at its hub in Cincinnati. Earlier this year, Comair announced it would shrink its fleet of 97 planes by more than half and cut staff over the next two years.

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