ABC News’ Michael Falcone, Aaron Katersky and Jordyn Phelps report:

9-9-9 is everywhere these days — even up in the air.

Spirit Airlines is running a new promotion, and it’s called the “9-9-9 Vacation Plan”:

It’s splashed prominently on the airline’s website and it was clearly inspired by Herman Cain’s 9-9-9 economic plan.

Here’s how the airline is plugging their deal: ”Let’s get real… America can’t wait until 2012, you need a vacation now!” reads a statement on the low-fare airline’s website.

Cain commented on the airline’s plan on Twitter on Thursday, saying “my campaign does not sponsor or endorse Spirit Airlines, but they are now offering a 9-9-9 Vacation Plan!”

The airline is having some fun with the political parody: “We have real solutions to reduce spending with fares from just $9 each way, based on roundtrip purchase. Book now or blame yourself! Fares are listed per person and do not include all taxes and fees. Additional baggage charges may apply.”

The airline, for example, is offering $9 fares between Los Angeles and Las Vegas on certain dates in November.

“We don’t comment on politics,” Misty Pinson, a spokeswoman for the airline told ABC News, “but just to set the record straight we were $9 before 9 was cool.”

On the campaign trail, Cain has been touting  his own version of the 9-9-9 plan, which drops the current 35 percent corporate tax rate to 9 percent, swaps the 6-bracket personal income tax system for a 9 percent flat tax and creates a 9 percent national sales tax.

In New Hampshire on Wednesday,  Cain defended the plan against opponents who are criticizing it.

“A plan can be simple without being simple-minded,” Cain said. “Someone once said, ‘simplicity is genius.’”

And Spirit airlines apparently hopes that “genius” is also lucrative.