The incident occurred at 1:30 p.m. as a 69-year-old Laurel man and a 52-year-old Beltsville, Maryland man were skydiving together over the airport.
As they descended, police say their parachutes became entangled.
This prevented one parachute from fully deploying, causing the parachutists to improperly land together.
The 69-year-old male was transported by Delaware State Police helicopter to Christiana Hospital, where he is being treated for non-life-threatening injuries.
The 52-year-old was transported by ambulance to Peninsula Regional Medical Center, where he was treated for minor injuries and released.