Team spokesman Tim Donovan said the man, who was not identified, was OK and that team trainers tended to him in the air for what was believed to be a diabetic coma. When the plane landed in Chicago, he was taken to a hospital. The flight eventually resumed, and the Heat landed in Miami at 5:04 a.m. Sunday
"Just landed back in the MIA feels good to be back home safe and sound," Heat guard Daequan Cook wrote on his Twitter feed.
Heat guard and Chicago native Dwyane Wade wrote on Twitter about the surprise landing.
"Hey everyone pray for our pilot," Wade wrote. "... He went into a Coma. God bless this man and his family."
Donovan said the man was in the cockpit when he became ill.
The team was returning to Miami after beating the Minnesota Timberwolves 97-84 Saturday night.