CITATION JET FLC RECEIVES CLRNC TO CROSS RWY AND OBSERVES SMA ON LIFTOFF; XING DIRECTLY OVERHEAD. FO CONCERNED THAT TWR GND CTLR DOES NOT ACKNOWLEDGE INCIDENT AND PIC DID NOT ACKNOWLEDGE COCKPIT COM WHEN XING RWY.

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WE HAD LANDED IN THE CITATION ON RWY 36L AT NEW AND EXITED TO THE E ON TXWY J. TWR HAD US CONTACT GND CTL. WE CALLED GND AT INTXN OF TXWY J AND TXWY B. INITIALLY RECEIVED CLRNC TO TAXI S ON TXWY B AND HOLD SHORT OF RWY 27. BEFORE REACHING THE HOLD LINE FOR RWY 27; GND THEN ISSUED A FURTHER CLRNC TO CROSS RWY 27 AND THEN TURN L ON TXWY F TO THE RAMP. PRIOR TO XING RWY 27; I LOOKED AND CALLED OUT LOUD; 'CLR TO THE R;' AND DIDN'T HEAR A RESPONSE FROM CAPT ABOUT 'L.' I LOOKED L AND SAW A DECATHLON SITTING OR TAXIING ON RWY 27. CAPT KEPT TAXIING ACROSS THE HOLD AND ONTO THE RWY. AT ABOUT THIS POINT; WE BOTH NOTICED THE DECATHLON WAS TAKING OFF. AT SOME POINT AROUND THE TIME WE RECEIVED THE SECOND PORTION OF THE UPDATED TAXI CLRNC; OR AFTER; GND ADJUSTED THE CLRNC TO 'CONTINUE ON TXWY B; L ON TXWY G AND TXWY F; THEN TO RAMP.' SOMEONE SHOULD HAVE NOTICED WHAT WAS HAPPENING AT THE INTXN OF TXWY B AND RWY 27 BTWN THE 2 ACFT. ONCE CLR OF RWY 27 AND THE TXWYS; AFTER NOT HEARING A 'PEEP' FROM GND CTL ABOUT WHAT HAD JUST HAPPENED; I CALLED GND REGARDING A CUSTOMS ISSUE; AND TO MENTION THE SIT WITH THE DECATHLON. I HAD ALSO REQUESTED A 'PROGRESSIVE TAXI' TO THE CUSTOMS LOCATION ON THE FIELD. FACTORS: SHOULD TWR REALLY HAVE PUT US ON GND FREQ PRIOR TO BEING CLR OF ALL ACTIVE RWYS? WE WERE GIVEN A CLRNC TO CROSS RWY 27 BUT HAVE NO IDEA WHO ACTUALLY MADE THE FIRST WRONG MOVE IN THE STRING OF EVENTS. WE COULDN'T HEAR TWR FREQ WHILE ON GND FREQ; WHICH MAY HAVE CLUED US IN EARLIER THAT THERE WAS A DEPARTING ACFT ON RWY 27. EXTRA ATTN NEEDED BY GND TO PROVIDE PROGRESSIVE TAXI. MY CAPT DIDN'T CLR THE L SIDE LIKE USUALLY DONE; UNTIL ON RWY. MY CAPT MAY HAVE BEEN DOING SOMETHING ELSE IN THE COCKPIT AT THIS CRITICAL TIME. VISUALLY; RWY 27 AT LAKEFRONT IS SMALL; AND DOESN'T STAND OUT LIKE A LARGER RWY. WE ALL NEEDED TO PAY BETTER ATTN! NOT SURE WHEN CAPT ACTUALLY FIRST SAW THE DECATHLON; BUT HE DIDN'T ATTEMPT TO SLOW DOWN OR STOP. I WAS SURPRISED THAT GND CTL NEVER MADE MENTION TO ME OR REQUESTED A PHONE CALL OR ANYTHING AT ALL. IT DEFINITELY HAPPENED THOUGH. ATTN AND CLRNC COMPLACENCY.