The Airlines Reporting Corp. (ARC), the airline-owned settlement service, will begin releasing, on a regular basis, monthly numbers for online travel agency and travel management company sales.

ARC has traditionally released monthly stats on travel agency sales, including the dollar amounts, numbers of transactions and a breakdown of things like domestic and international fares.

For example, total travel agency sales remitted through ARC in November 2009 increased 6.72% to $5.1 billion, compared with the previous November, and this was the first monthly uptick of the year.