AMA LCL CTLR PUT AN SF3 ACR INTO POSITION AND HOLD WHILE ANOTHER ACR DEPARTED DOWN FIELD. WHILE IN POSITION; THE SF3 CREW SPOTTED A LEAR JET ON BASE AND TAXIED OFF THE RWY.

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WE TAXIED TO THE APCH END OF RWY 22. WE WERE THEN CLRED BY TWR TO TAXI INTO POSITION AND HOLD; ACR ACFT WOULD BE DEPARTING DOWNFIELD. HE WAS WAITING FOR DEP TFC SPACING. I STOPPED ON THE RWY AT A 45 DEG ANGLE TO PROVIDE A VIEW OF THE FINAL APCH TO RWY 22 FOR THE FO. I NOTICED AN ACFT ON TCAS WHICH APPEARED TO BE ON BASE AT 1000 AGL. I ASKED THE FO TO SPOT THE ACFT; HE SAID THE ACFT WAS TURNING FINAL. ACR ACFT WAS CLRED FOR TKOF. WHEN THE TCAS WAS INDICATING 700 AND 500 FOR THE ACFT ON FINAL I ASKED THE FO IF THE ACFT WAS LNDG; HE STATED BOTH TIMES IT WAS STILL LNDG. I INITIATED A TURN OFF THE RWY AND ADVISED THE TWR WE WERE CLRING THE RWY. TWR ASKED IF WE NEEDED ASSISTANCE. I STATED NO I JUST DIDN'T WANT TO SIT ON THE RWY WITH THAT ACFT ON SHORT FINAL. AS I TURNED THE ACFT AROUND TOWARDS THE RWY; THE OTHER ACFT; A LEAR JET; LANDED ON THE RWY EXACTLY WHERE WE WERE IN POSITION. WE SUBSEQUENTLY DEPARTED AFTER WAITING FOR ANOTHER ACFT ARR. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR SAID WHEN THEY TAXIED OFF THE RWY TO LET THE LEAR JET LAND; THE TWR CTLR ASKED THE SF3 CREW IF THEY HAD PROB. HE SAID THEN THERE WAS TOTAL SILENCE ON THE FREQ FOR ABOUT A HALF A MINUTE. RPTR THINKS THE CTLR FORGOT ABOUT THE LEAR JET WHEN THEY WERE PUT INTO POSITION. RPTR SAID WHEN THE LEAR JET CLRED THE RWY; THEY WERE CLRED FOR TKOF AND NOTHING MORE WAS SAID.