LTT LANDS ON RWY NOTAMED CLOSED.

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SELECTED RWY 33L FOR LNDG AND LANDED WITHOUT INCIDENT. BECAME AWARE THE NEXT DAY THAT RWY 33L/15R WAS LISTED IN NOTAMS AS OTS; ALONG WITH ITS PARALLEL TXWY 'D.' UPON FURTHER REVIEW; IT WAS APPARENT I OVERLOOKED THE NOTAM THAT WAS INCLUDED WITH DISPATCH PAPERWORK. AT TIME OF APCH AND LNDG SPS TWR WAS CLOSED. DECISION TO UTILIZE RWY 33L WAS BASED ON THE FOLLOWING: WIND RPTED IN THE HRLY SEQUENCE ABOUT 40 MINS PRIOR WAS LIGHT (6) FROM THE SE; ESSENTIALLY NOT ELIMINATING ANY RWY FROM CONSIDERATION. NOT WANTING TO UTILIZE RWY 17/35 DUE TO A SPECIAL TFC PATTERN PROC THAT PREVENTS RAMP AREA OVERFLT AND CONFLICTS WITH MIL TRAINING ACFT. WHILE PROBABLY NOT AN ISSUE AT NIGHT WITH TWR CLOSED; I PREFER NOT TO EXECUTE THE PROC FOR PAX COMFORT REASONS. RWY 33L IS EXTREMELY WIDE AND LONG; A MINIMAL TAILWIND AND XWIND COMPONENT WAS EXPECTED; AND THE MOST EXPEDITIOUS STRAIGHT-IN APCH COULD BE CONDUCTED. THE AFTER-HRS ATIS MADE NO MENTION OF A CLOSURE. THE RWY 33L RWY LIGHTS WERE ILLUMINATED NORMALLY. WE ADVISED ZFW OF OUR INTENDED LNDG RWY PRIOR TO BEING CLRED FOR A VISUAL APCH TO SPS. FT WORTH DID NOT MENTION A CLOSURE (NOR WAS IT THEIR RESPONSIBILITY TO DO SO; BUT IT WOULD NOT BE UNUSUAL FOR CTR TO BE READILY AWARE OF SUCH A CLOSURE AND TELL US). WHEN SPS TWR OPENED; I TELEPHONED AND SPOKE WITH AN ENLISTED CTLR. HE SAID THE NOTAM HAD BEEN ISSUED IN ERROR AND RWY 33L/15R WAS NOT ACTUALLY CLOSED. HE SAID THE NOTAM WAS MEANT TO INDICATE RWY 33R/15L CLOSED; BUT ARPT AUTHS HAD NOT ACTUALLY CLOSED ANY RWYS; HAVING CHANGED THEIR MINDS BEFORE LEAVING FOR THE WEEKEND. WE NOW KNOW THE NOTAM WAS INCORRECT IN 2 WAYS; THERE WAS NO RWY CLOSURE AT ALL; AND THE 'PROPOSED' CLOSURE WOULD NOT HAVE IMPACTED OUR FLT. BUT OUR FAILURE TO COMPREHEND A NOTAM DEMONSTRATES THE IMPORTANCE OF THOROUGH PREFLT PLANNING. OUR PAPERWORK OFTEN SEEMS DAUNTING; IN ADDITION TO FLT PLAN SPECIFICS AND WX; GENERAL NOTAMS; FDC NOTAMS AND FIELD RPTS CONTRIBUTE TO AN ABUNDANCE OF INFO; SOME OF IT EXTRANEOUS TO OUR OP. INFO AS DIRE AS A RWY CLOSURE IS OFTEN BURIED IN PARAGRAPHS OF RECURRING RPTS THAT HAVE BEEN ISSUED AND NOTED PREVIOUSLY (FOR INSTANCE; THIS PARTICULAR RELEASE INCLUDED ABOUT 1 PAGE CONCERNING A 1 DEG COURSE CHANGE ON EVERY SBOUND IAP AT DFW; WHICH WE HAVE SEEN FOR MANY WKS). WE MUST ALLOW THE TIME AND EFFORT TO EXAMINE EVERY SENTENCE OF INFO PROVIDED FOR FLT PLANNING.