As we conjectured about here last week, Northwest didn’t take much time to unload the expected heavy artillery — and aim it directly at Frontier’s recently announced expansion into Memphis.

Northwest announced Monday that it was going to increase its flying out of Memphis to Orlando, Denver, and Las Vegas. Duh. So are we surprised? These are the same three routes Frontier announced last week.

And on the Denver routes, (just in case Frontier missed the intent of the announcement) the airline really brought out the reinforcements as the airline will move from flying three fifty-seat regional jet flights a day to three A319s and A320s. You can do the math.

These changes take effect June 7.

Northwest also announced new service from Memphis to Seattle and Indianapolis as part of the same release.

Good luck to the folks at Frontier.

Ticker: (FRNT:Nasdaq)