(CNN) -- An unexplained chemical smell forced Continental Airlines flight 007 to return to San Antonio's airport Thursday morning, aviation officials said.
The pilot and a flight attendant noticed the strong odor before the halfway point in the 50-minute trip to Houston, forcing the pilot to turn back to San Antonio, FAA spokesman Lynn Lunsford said.
The 152 passengers exited the Boeing 737-800 down a set of stairs, where medical crews were waiting to examine them.
San Antonio airport spokeswoman Nora Castro said one person was taken to a hospital for examination.
Airline employees began examining the aircraft for the source of the odor, Lunsford said.
CNN's Mike Ahlers and Devon Sayers contributed to this report.