FLT CREW GOES VISUAL PREMATURELY ON APCH TO UNFAMILIAR ARPT. LAND AT BEC VICE AAO.

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WE WERE INBOUND FROM THE NE; TO LAND AT AAO. THE ACTIVE RWY WAS RWY 36. WITH A CEILING OF 2200 FT AGL; 7 MI VISIBILITY; AND WINDS FROM THE N OF 20 KTS; WE BRIEFED FOR THE RNAV GPS RWY 36 APCH; WITH THE POSSIBILITY OF A VISUAL APCH. WE WERE CLRED TO DSND TO 3000 FT; AND TO PROCEED DIRECTLY TO WUMPA INTXN WHICH IS THE INITIAL FIX FOR THE APCH E OF THE FINAL COURSE AND SE OF THE ARPT. BEFORE REACHING WUMPA; WICHITA APCH TURNED US W FOR A VECTOR TO INTERCEPT THE FINAL APCH COURSE INSIDE OF CATCH INTXN. PROCEEDING W ON A R BASE LEG AT 3000 FT MSL; WE WERE IN GOOD VMC AND BEGAN LOOKING FOR THE ARPT. I SPOTTED WHAT I BELIEVED TO BE THE AAO ARPT AT 2 O'CLOCK POS; AND SHORTLY THEREAFTER THE SIC PLT WHO WAS FLYING; CONFIRMED HE HAD VISUAL CONTACT WITH THE ARPT ALSO. I RPTED THE ARPT IN SIGHT TO WICHITA AND THE CTLR CLRED US FOR THE VISUAL APCH. SHORTLY THEREAFTER; I CANCELED THE IFR FLT PLAN AND SWITCHED TO UNICOM. WHAT I THOUGHT WAS AAO ARPT WAS ACTUALLY BEECH FACTORY (BEC) ARPT; ONLY 3 MI S OF AAO. IT IS SLIGHTLY E OF THE GPS APCH CTRLINE TO AAO; AND ALSO HAS 1 RWY OF THE SAME ORIENTATION -- RWY 36/18. I HAD SET THE AAO ILS DME ON THE #1 VOR FOR REF; BOTH FMS'S WERE SET UP FOR THE GPS APCH TO RWY 36 AT AAO; AND 'MAP MODE' WAS IN USE. WE WERE USING ALL OF THESE AS REFS UNTIL SHORTLY BEFORE TURNING FINAL; THEN NAVED VISUALLY FOR LNDG TO WHAT WE THOUGHT WAS AAO; BUT WAS ACTUALLY BEECH FACTORY ARPT (BEC). NOT REALIZING THIS; WE LANDED AT BEC. THE TWR CALLED US ON UNICOM; HAD US CHANGE TO THEIR FREQ; AND THEN CLRED US FOR TKOF TO AAO. THERE WAS NO MENTION OF ANY TFC CONFLICTS; NOR DID WE OBSERVE ANY TFC IN THE PATTERN OR ON THE GND AT BEC. THIS COULD HAVE BEEN AVOIDED BY: 1) CONTINUING TO REF ELECTRONIC NAV TO NEAR TOUCHDOWN AFTER BEING CLRED TO THE VISUAL. 2) MORE CAREFUL SCRUTINY OF AREA ARPTS WHEN CONDUCTING THE APCH BRIEFING. 3) REMAINING WITH ATC ON THE IFR FLT PLAN UNTIL LNDG. 4) FOLLOWING THE APCH COMPLETELY INSTEAD OF REQUESTING A VISUAL APCH. 5) A CAUTIONARY WORD FROM WICHITA APCH WHEN CLRING AN ACFT FOR A VISUAL APCH TO ANY OF THE SEVERAL ARPTS IN THIS AREA. THIS SHOULD BE A STANDARD OPERATING PROC FOR ATC. HOW IRONIC THAT THE LAST 2 FIXES ON THIS APCH ARE CATCH AND YOKJU. CATCH YOU.