The fall air wars are amping up in a top House race in Arizona.  

Ret. Air Force Col. Martha McSally, a Republican challenging Democratic Rep. Ron Barber, placed television reservations in the Tucson media market for the final weeks of the 2nd District race, according to a campaign source.  

The total sum of the McSally buy is $460,000 on broadcast and cable in the relatively inexpensive market.  

Additionally, House Majority PAC, a Democrat-aligned super PAC, is upping its own reservation in the district from $140,000 to $440,000, according to a Democratic source watching the Tucson media market.  

McSally and Barber are facing off in the Tucson-based district previously held by Democrat Gabrielle Giffords. The pair squared off in 2012 for what ended up as one of the narrowest margins of the cycle — less than 3,000 votes.  

“Southern Arizonans are looking for a fresh voice representing them in Washington, and this early reservation will ensure that they hear directly from Martha McSally about how she’ll fight for them in Congress,” McSally spokesman Patrick Ptak said in a statement.  

The race is rated as a Tossup  by Rothenberg Political Report/Roll Call.