Do more U.S. airports need control towers? That's one of the questions that has arisen following a midair collision at an airport in southern Arizona last week.

The crash at the Marana Regional Airport, about 21 miles northwest of Tucson, is the second fatal aviation mishap this month in Arizona.

It marks the second fatal incident at an Arizona airport in the past 10 days. On Feb. 10, the pilot of a private jet owned by Mötley Crüe singer Vince Neil was killed after a runway collision between two aircraft at Scottsdale Airport.

Tens of thousands of planes take off, land and perform touch-and-goes at the Marana Regional Airport in southern Arizona every year. Without an air traffic control tower, it's a calculated dance that requires communication by pilots.