The second person in the United States diagnosed with Ebola flew on a domestic flight from Cleveland to Dallas-Fort Worth airport on Monday evening, before she went to the hospital with a low-grade fever on Tuesday morning, officials said on Wednesday.
There were 132 passengers on Frontier Flight 1143, the airline announced.
The Texas Health Presbyterian Hospital employee on the flight was among those taking care of Thomas Eric Duncan, the Liberian national who died from the disease while being treated at the hospital.
Ebola is not transmissible until symptoms of the disease appear, but it was unclear in initial reports if the female passenger, who was found to have Ebola on Tuesday evening, was showing symptoms during the flight on Monday night.