Large Transport; Low Wing; 2 Turbojet Eng
Flight Crew Air Transport Pilot (ATP)
Flight Crew Last 90 Days 100; Flight Crew Total 20000; Flight Crew Type 2000
Deviation - Track / Heading All Types; Deviation / Discrepancy - Procedural Clearance
Air Traffic Control Provided Assistance; Flight Crew Became Reoriented; Flight Crew Returned To Clearance
Airspace Structure
Enroute to ROD; ATC instructed us to amend our clearance: direct to KLYNE then direct to DJB and then filed route. I entered KLINE as the cleared to fix and it appeared on the FMS as reasonable slight turn left of 20 degrees approximately 40 NM ahead. The first officer agreed and I executed the turn. After a few moments ATC asked if we were proceeding to KLYNE at which time I reentered fix as KLYNE and saw that it was same relative distance from our original position but instead was approximately 20 degrees right turn. We made the correction with no further issues. No traffic conflict occurred. Due to the close proximity of these two identically pronounced fixes; it would be advised that one of the two fixes should be renamed.
Air carrier Captain reported entering 'KLINE' into the FMS instead of the correct spelling 'KLYNE.' The two fixes are in close proximity and the error was not initially apparent.