ACFT LANDED ON CLOSED PORTION OF RWY. THRESHOLD WAS DISPLACED AS A RESULT OF PARALLEL TXWY UNDERGOING CONSTRUCTION.

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CLRED FOR A VISUAL APCH TO RWY 22 WHILE ON A BASE AT 6000 FT (2400 FT AGL). THE LDA AND PAPI WERE OTS. I WAS USING THE LNAV FEATURE OF THE IRS TO GET A GS TO RWY 22. IT WASN'T UNTIL TOO LATE; IN THE FLARE; THAT I SAW THE YELLOW ARROW MARKINGS AND REALIZED THE THRESHOLD WAS DISPLACED 5282 FT TO NEAR TXWY B. WE LANDED IN THE DISPLACED THRESHOLD AREA. THE THRESHOLD WAS DISPLACED SO WORK COULD BE PERFORMED ON TXWY C; NOT FOR ANY STRUCTURAL REASON AND NO WORKERS WERE PRESENT. DIGITAL ATIS IS NOT AVAILABLE AT AMA. THE FO HAD COPIED THE ATIS BEFORE DSCNT AND DID NOT NOTATE ANYTHING ABOUT THE DISPLACED THRESHOLD; NOR WAS THERE ANY NOTICE BY DISPATCH ON THE RELEASE ABOUT IT AND ATC SAID NOTHING ABOUT IT IN THE LNDG CLRNC. AFTER REVIEWING THE WX PACKAGE MORE THOROUGHLY; I FOUND THE NOTAM THERE. THE LAST 4 OR 5 TIMES I'VE BEEN TO AMA; I'VE LANDED ON RWY 31/13 BUT WT AND WIND WOULD NOT ALLOW IT THIS TIME. I WAS NOT FAMILIAR WITH THE DISPLACED THRESHOLD ON RWY 22. CAPTS SHOULD ALWAYS CHK THE NOTAMS SECTION OF THE WX PACKAGE THOROUGHLY. DISPATCH SHOULD INCLUDE IMPORTANT NOTAMS IN THE REMARKS SECTION OF THE RELEASE. ATC SHOULD ADVISE OF DISPLACED THRESHOLDS IN THE LNDG CLRNC.