It’s not easy in the regional airline industry these days, as Mesa found out a couple of weeks ago when Delta Air Lines notified the airline that it was canceling its contract for more than 35 EMB-145 aircraft.

Today — it appears that Frontier Airlines has severed its regional flying contract with Republic Airways Holdings.

This contract was not for fifty-seaters, however. This contract included 12 76-seat E170 aircraft — an airplane that is in much higher demand.

The agreement provides for an orderly wind-down under which Republic will remove four aircraft on May 1, an additional six aircraft on June 2 and the final two aircraft on June 23, 2008. Immediately prior to Frontier’s filing, Republic was generating approximately $6 million in gross monthly revenues under the agreement.

There are also another five E170 aircraft that were slated to go to Frontier that will now have to be placed with another airline or sold.

As a result of Frontier canceling the agreement, Republic says that it will seek a payment of $260 million. I guess this means Republic will now get at the back of the line in bankruptcy court.

Republic said in a press release that it will discuss all of this on its earnings call tomorrow.

The most troubling comment in the Republic press release? Republic’s CEO Bryan Bedford’s comment, “It’s unfortunate that despite their [Frontier’s] many efforts to reorganize their business outside of Chapter 11, factors beyond their control conspired to force a deeper reorganization.”

Even more unfortunate is that this particular part of Frontier’s business plan was the one that was supposed to be the “Southwest Buffer” — an attempt to grow service to markets that Southwest Airlines could not duplicate out of Denver.

Not a good sign for the fine folks at Frontier, who recently filed for Chapter 11 protection after its credit card processor increased the airline’s holdback allowance.

Technorati Tags: Delta Air Lines, Frontier Airlines, regional airlines, Republic Airways