Flight Crew Air Transport Pilot (ATP)
Fatigue; Situational Awareness
Deviation - Track / Heading All Types; Deviation / Discrepancy - Procedural Published Material / Policy
General None Reported / Taken
Human Factors
About 15 minutes after landing it was brought to my attention that I was at the scheduled alternate airport instead of the scheduled intended airport. The cause of the mistake was initiated when I had entered the alternate airport as destination airport into the FMS and iPad. This mistake was never identified by either myself or the pilot monitoring. Halfway into the flight ATC asked us the name of the airport where we were landing and we replied what was in our FMS; the alternate airport. ATC did not question this; which only reinforced our error. Approach control cleared us for an approach to the wrong airport and the tower cleared us to land. Upon shutting down at the gate; I called [company] and informed [them] of our arrival. At that time the passenger deplaned without saying a word about the airport. The FBO at first didn't say anything to me about being at the wrong airport. Everything seemed normal until I contacted dispatch about our next release. At that time it was discovered that I was at the wrong airport. I contacted [company] and informed them of the situation. They did not indicate any problem. I did not have any contact with the passenger after he left the aircraft. I did not walk him into the FBO. I stayed in the aircraft as the PIC escorted the passenger. By the time I entered the FBO the passenger had left. We received a release to [a new destination] and flew there without further incidentAll the necessary procedures for entering data into the FMS have already been put into operation. I cannot think of anything to improve the procedures. I cannot explain how or why I entered the wrong destination or why it was not corrected. All the waypoints were double checked per procedures; but the destination was not noticed to be wrong. With some fatigue it is possible; as in this case; that the crew could enter the wrong airport in the FMS as the destination.
All I can add to the above is that I should have put the destination in my iPad from my brief not the box my partner programmed; then I would have caught our mistake. I also wish when ATC questioned our destination I would have looked at my phone not iPad.
Light transport flight crew reported landing at the wrong airport following an FMS programming error.