Original sentence: The FAA has rejected the NTSB's proposal, and has refused to ground the airplanes
Edited sentence: In reacting to the NTSB recommendations the FAA Administrator Randy Babbit declined to ground the aircraft and in a 13 July 2009 letter, stated "Data indicates the CH-601XL has a safety record similar to other S-LSA and appears capable of safe flight and operations if maintained according to the manufacturer’s recommendations