You're probably thinking of CHQ.
From
The Airline Codes:
IATA Code: RP*
ICAO Code: CHQ
Known As: USAirways Express
Full Name: Chautauqua Airlines, Inc. d/b/a USAir Express
Country: United States of America
Callsign: Chautauqua
This is the regional carrier for US Airways and America West, operating also as America West Express.
BL.