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MIAMI (CBSMiami) – A Miami to Atlanta Delta flight was delayed at Miami International Airport Thursday morning after crewmembers fell ill inside the aircraft.

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Authorities said flight number 940 was leaving for Atlanta when crewmembers began complaining of a smell and asked for medical attention.

It happened at around 8:30 a.m. while the plane was on the tarmac, authorities said.

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A total of three patients were transported to Doctors Hospital in Coral Gables, a fourth person refused transport, according to authorities.

On Thursday morning, Delta released the following statment: “Delta apologizes to customers on flight 940 from Miami to Atlanta following a delay due to a crew illness that resulted in a crew swap prior to boarding.”

There is no word on their condition at this time or what may have caused their illness.

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The plane was rescheduled to depart later in the day.