MLG PIC REPORTED A TFC CONFLICT AT HDN ARPT AND HAD TO TAKE EVASIVE ACTION TO AVOID A GA ACFT ON APCH TO THE SAME RWY. THERE WERE LIMITED COMS ON THE UNICOM FREQ FROM THE GA ACFT.

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APCHING HAYDEN/STEAMBOAT SPRINGS ARPT; WE ADVISED HDN UNICOM OF OUR R DOWNWIND TO RWY 10 AS WE CROSSED OVER THE FIELD TO THE SW TO ALLOW AN AIRLINER TO DEPART; WE HEARD ACFT Y REPORT 25 SW OF HDN ON UNICOM. AT 8 MILES AND 9200 FT; WE TURNED BACK TOWARD THE ARPT FOR A VISUAL APCH TO RWY 10; WITH THE CLBING AIRLINER IN SIGHT AND NOT A FACTOR WE ALSO HAD A VISUAL ON THE RWY AT 7 MILES AND RPTED TURNING FINAL; AT THIS TIME MY FO NOTICED ACFT Y DSNDING FROM BEHIND US AND TO THE R AT A HIGH RATE OF DSCNT; AT FIRST I BELIEVED HE WOULD TURN R TO ENTER A R DOWNWIND BEHIND US; INSTEAD HE ANNOUNCED HE WAS TURNING A 6 MILE FINAL FOR RWY 10; EVEN WITH HIS DIVE FOR THE RWY AT OUR 145 KTS WE WERE QUICKLY CLOSING IN ON ACFT Y. I ELECTED TO DO A 360 DEG TURN TO ALLOW SEPARATION (THEN CONTINUE TO A NEAR THE GND GO AROUND DUE TO ACFT ON THE RWY). THE WX WAS CLEAR AND GOOD VISIBILITY 10 MILES PLUS WITH LIGHT WINDS. WE MADE THE VISUAL APCH TO LNDG WITH NO FURTHER INCIDENT. WE NOTICED ACFT Y UNLOADING THEIR PAX ON THE RAMP. I ADVISED OUR GND PERSONNEL THAT WE HAD TO TOUR THE COUNTRYSIDE WHILE ACFT Y CUT IN FRONT OF US ON LNDG. THEY ADVISED ME THEY HEARD THE WHOLE THING ON THE RADIO. I THEN QUESTIONED THEM IF IT WAS COMMON FOR ACFT TO JUMP IN FRONT OF OTHER ACFT LIKE THAT. THEIR RESPONSE IS THAT IT DOES HAPPEN OFTEN AND THEY WISHED SOMEONE WOULD DO SOMETHING ABOUT IT. THE VOLUME OF TFC IN HDN THIS TIME OF YEAR WITH THE LARGE MIX OF CORPORATE; AIRLINE; AND GA IS BECOMING A PROBLEM. I DO NOT KNOW IF ACFT Y SAW US OR NOT OR TO PLEASE HIS BOSS HE JUST RUSHED AHEAD TO BEAT US TO THE RWY; AT ANY RATE; SOMEONE NEEDS TO TAKE A CLOSER LOOK AT HDN ARPT TO SEE IF AN OPERATIONAL TWR IS NEEDED DURING THE WINTER SEASON. HAD EITHER OF OUR PATHS BEEN A LITTLE L OR R; WE WOULD HAVE NEVER SEEN HIM HIGH AND BEHIND US AND UNABLE TO ADJUST OUR FLT PATH. NOT A GOOD THING. HDN HAS A GOOD ARPT AND FACILITIES. A SEASONAL TWR WOULD HELP KEEP IT THAT WAY.CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR INDICATED THAT THE TFC SITUATION IS EXTREME AT THE FIELD DURING THE SKI SEASON. HE HAS OPERATED INTO THE ARPT FOR SEVERAL YEARS AND INDICATED THAT WITH THE ADVENT OF THE FRACTIONAL AND CHARTER ACFT; THE TFC APPEARS TO HAVE INCREASED TEN FOLD. HE IS EMPLOYED BY A PART 121 CARRIER AND WAS CONCERNED THAT THE MIX OF GA; CORPORATE; AND COMMERCIAL ACFT WITHOUT A TWR COULD POSSIBLY LEAD TO AN INCIDENT. HIS DISCUSSION WITH THE CARRIER'S GND PERSONNEL AFTER LNDG INDICATED THAT THESE TYPES OF INCIDENTS ARE VERY COMMON AND OCCUR DAILY. HIS SUGGESTION WAS FOR A SEASONAL TWR TO PROVIDE SOME SORT OF CTL. DURING HIS DEP FOLLOWING THE INBOUND INCIDENT; HE RELATED THAT HE WAS #4 FOR TKOF BEHIND SEVERAL CORPORATE AND GA ACFT. ALL COMS WERE ON A UNICOM FREQ BETWEEN THE ACFT AND THAT IT WAS COMPLETELY 'SELF CTLED.' THERE WERE SEVERAL ACFT WAITING BEHIND HIS ACFT; TO INCLUDE ANOTHER AIR CARRIER.