WHILE ON THE GND IN BOS; A B737 FLC TAXIED AHEAD OF A DC9 THAT THEY HAD BEEN INSTRUCTED TO FOLLOW. THE FREQ WAS CONGESTED AND THE B737 WAS FAR AHEAD OF THE DC9; SO THE CAPT CONTINUED THE TAXI IN LIEU OF DELAYING AND THE FO ADVISED THE CTLR ON FREQ WHEN HE WAS ABLE TO XMIT.

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AFTER LNDG AT BOS RWY 4R; WE WERE CLRED TO TURN L ON RWY 33L THEN TO HOLD SHORT OF RWY 4L AND TAXI BEHIND OUR COMPANY DC9 APCHING ON TXWY N. WE ACKNOWLEDGED. AFTER BEING CLRED BY TWR TO CROSS RWY 4L AND FOLLOW THE COMPANY DC9 ON TXWY N AND SWITCH TO GND CTL; WE CROSSED RWY 4L AND WERE ON RWY 33L AWAITING THE DC9; BUT IT WAS STILL A SUBSTANTIAL DISTANCE TO OUR R; AND IT APPEARED STOPPED. SINCE WE WERE UNDER PWR TAXIING (AFTER XING RWY 4L) I TRIED TO CONTACT GND PER THE CAPT'S INSTRUCTIONS; TO ADVISE GND THAT WE WOULD LIKE TO CONTINUE OUR TAXI ROLL SINCE WE WERE FAR AHEAD OF THE DC9. GND CTL FREQ WAS VERY BUSY; SO THE CAPT ADVISED THAT HE WOULD CONTINUE HIS TAXI PUTTING US IN FRONT OF THE DC9. WHEN ABLE; I NOTIFIED GND THAT WE WERE CLR OF ALL RWYS AND WOULD LIKE TO CONTINUE TO OUR GATE. GND CLRED US AS REQUESTED AND THERE APPEARS TO HAVE BEEN NO CONFLICT SINCE THE DC9 WAS STILL FAR BEHIND US ON TXWY N. CONGESTED FREQS ARE AN EVERYDAY PROB THAT NEEDS TO BE ADDRESSED. NO PROB WAS INDICATED.