A mid-air crash between two small planes in Arizona has killed two people, authorities say.

The crash occurred at Marana Regional Airport, which is 25 minutes west of I-10 from Tucson.

The two planes involved were a Cessna 172 and a Lancair 360 MK II. The Cessna landed normally without trouble, but the Lancair caught fire on the runway, killing two people aboard. Marana Police said that first responders didn’t have a chance to administer aid.

AeroGuard, a flight school that owned the Cessna, said its pilots were unharmed.

Marana Regional Airport has two intersecting runways and no air traffic control tower.

Plans were made to construct a tower, but they were delayed due to the COVID-19 pandemic and haven’t resumed.

The lack of air traffic control towers doesn’t necessarily mean that an airport is unsafe, as tens of thousands of flights enter and exit the airport annually with no issue.

Most airports in the US do not have air traffic control towers to begin with.

Because of this, the responsibility falls upon the pilots to land safely.

“All the pilots should be broadcasting on this common traffic advisory frequency. And there’s also a responsibility to see and avoid,” stated Jeff Guzetti, former FAA and NTSB investigator, to the Associated Press. “Each pilot is responsible to see and avoid so they don’t collide with each other.”

AeroGuard spokesman Matt Panchias released a statement to the AP following the crash:

“We are deeply saddened by the two fatalities from this tragic accident, and our thoughts and prayers are with their families and loved ones during this difficult time.”