PHOENIX -- CBS 5 investigated potential security risks at local airports just days before Glendale is set to host one of the biggest events ever to come to the Valley.

Security at Sky Harbor Airport is a hassle, but it's meant to keep terrorists off airplanes.

But as 5 Investigates found, gaining access to runways and airplanes at other Valley airports can be as easy as walking through a door at the mall.

5 Investigates tested the security at five airports in and around the Valley and found some unbelievable security holes, including hundreds of airplanes anyone can get their hands on.

The airports are in Glendale, Chandler, Coolidge, Eloy and Casa Grande. All are within a short flight of this weekend's Super Bowl, and they're all small or "general aviation" airports that cater to private and charter props and jets.

"No security cameras anywhere. None," counterterrorism consultant Bob Newman noted.

Newman accompanied 5 Investigates onto the tarmac and runways at all five airports.

At each stop, he spent 45 minutes wandering around the planes -- single-engine props, King Air charters, even a DC-7.

5 Investigates videotaped the planes, tried to open doors and even got inside planes in Chandler, Eloy and Glendale.

"We were able to walk just right through and out onto the tarmac. Should we have been able to do that?" investigative reporter Morgan Loew asked.

"That depends on who you ask. But since you're asking me, the answer is absolutely not," Newman said.

In Coolidge and Eloy, there was nobody monitoring the self-service fuel stations.

"I can take an aircraft, very easily, come over here, fill it right up with my credit card and I'm off to the Super Bowl. Except I'm not there to watch the game," Newman said.

In Casa Grande, there were at least two openings in the shiny new airport fence big enough to drive through and reach the runway.

"We weren't out there looking for snipers and electric fence," Loew said. "We were looking for very basic security measures and we didn't appear to find any of them."

"If you were to do the same check today, or as you get even closer to the Super Bowl, you would find an increased security awareness by not only our members, by the airport employees and also by the local law enforcement," said Phil Boyer, president of the Aircraft Owners and Pilots Association.

Boyer said the billions of dollars it would take to secure every general aviation airport across the country outweighs the relatively small risk of a terrorist stealing a small plane.

"At this moment, should the general public be concerned about GA airports? Not anymore than all kinds of other public facilities," Boyer said.

But Newman argues that even a small plane in the wrong hands could create panic -- targeting a school, chemical plant or even the Super Bowl would spark chaos even if the planned attack failed.

"A terrorist can come to a general aviation airport and have the same effect economically and never kill a soul," Newman said.

Security at general aviation airports is not regulated by the federal government; instead, security decisions are left to the local governments that run those airports. 5 Investigates notified officials with the state and each city where the airports are located about the results of the investigation.

The airports have increased security this week; the FAA has imposed flight restrictions over the Phoenix area for game day; and at least three of the airports -- Chandler, Glendale and Casa Grande -- are either in the middle of security upgrades or have them planned for the near future.