SQL Select when record is 1 then bring back line else bring back the 0 record : I need a little help with a query.

I have written a script that brings back an order number and the number of containers needed. (Code Below)

    SELECT
    	CONI.CONTNO,
    	CONI.ITEMNO,
    	CONI.[WEIGHT],
    	CONI.QTY,
    	STOK.PGROUP,
    	CASE WHEN CPRO.TNTCOL = 1 THEN 1
    		 WHEN CPRO.TNTCOL = 0 THEN 0
    		 WHEN CPRO.TNTCOL IS NULL THEN 0 END AS [TNT],
    	CONI.RECID,
    	CPRO.RECKEY
    INTO
    	#SUB
    FROM
    	ContItems						CONI
    	LEFT JOIN ContractItemProfiles	CPRO	ON CONI.RECID = CPRO.RECKEY
    	JOIN Stock	STOK	ON CONI.ITEMNO = STOK.ITEMNO
    WHERE

    	STOK.PGROUP LIKE 'FLI%'
    
    
    SELECT
    	
    	#SUB.CONTNO,
    	#SUB.TNT,
    	SUM(#SUB.QTY) AS [Number of flight cases]
    FROM
    	#SUB
    WHERE
    	#SUB.CONTNO = '123/321581'
    	 
    GROUP BY
    	#SUB.CONTNO,
    	#SUB.TNT
    DROP TABLE #SUB

Then I get the Result:

    Contno	    TNT	   Number of flight cases
    123/321581	 0	   20.00
    123/321581	 1	   1.00

I need to conditionally bring back the line that has the TNT = 1 Else if there isn't a 1 in the TNT column then bring back the record with 0

I hope this is explained enough.