Delta flight from Las Vegas canceled after passengers suffer heat-related illnesses while waiting on tarmac

Passengers on a Delta flight from Las Vegas to Atlanta experienced extreme heat and lack of air conditioning while delayed on the tarmac.
Multiple passengers fainted or passed out and required medical attention.
Paramedics responded and several passengers were taken off the plane on stretchers.
The flight was eventually canceled after the pilot reported multiple emergencies.
Delta apologized, offered compensation, and is investigating the circumstances that led to the uncomfortable cabin temperatures.