On JetBlue A320 flight from Boston to San Diego with 126 passengers was diverted to Buffalo, had to evacuate the passengers after fumes sickened members of the crew, whereas a pilot and two flight attendants were taken to a hospital.
Just hours earlier in Fort Lauderdale, ambulances waited as JetBlue flight 385 bound for Barbados returned to the gate. An emergency dispatcher said they were informed of a plane coming back with three flight attendants with headache and some were on oxygen, because of fumes.
And last week, a third JetBlue Airbus with 153 on board made an emergency landing in Oklahoma City due to an odor in the cabin. Three crew members and two passengers were taken to the hospital.
Former NTSB chair Mark Rosenker stated that Jet aircraft gets its air that people breathe from the engines. He further mentioned that in rare instances, the seals on the engines can leak, allowing chemicals in.
JetBlue and the FAA are investigating all three incidents.