MLG ACR ACFT FOLLOWING APCH CTLR DIRECTIONS MAY HAVE MISUNDERSTOOD CLRNC AND LANDED WITHOUT CONTACTING TWR. FLC HEARD AND READ BACK THAT THEY WERE CLRED TO LAND AND APCH CTLR DIDN'T CORRECT THEM OR DIRECT THEM TO CONTACT TWR. BECAUSE THERE WAS AN APPARENT EMER IN PROGRESS THE TWR WAS VERY BUSY.

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ACR A FLT CLRED TO LAS VEGAS APCH CTL. APCH CTL DIRECTED US TO FOLLOW A ACR B JET. WE CALLED THE VISUAL ON THE ACR B JET. APCH CTL THEN DIRECTED US TO MAINTAIN VISUAL SEPARATION WITH THE ACR B ACFT AND WERE 'CLRED FOR A VISUAL APCH TO LAND ON RWY 25L.' FLT RPTED L BASE FOR RWY 25L AND DIRECTED TO LAND #2 BEHIND ACR B JET. FLT ACKNOWLEDGED CLRED TO LAND RWY 25L. REMAINDER OF FLT WAS UNEVENTFUL AND TAXIED TO PARK. PERCEPTION DURING TAXI TO PARK: ALTHOUGH WE ACKNOWLEDGED A CLRNC TO LAND WE WERE CONCERNED AS TO WHETHER WE ACKNOWLEDGED AN APCH CTLR; TWR CTLR; OR IF WE HAD RADIO PROBS. APCH SEEMED TO BE BUSY WITH A ACR HVY JET THAT WAS HAVING SOME SORT OF PROB BEHIND US AND THE TFC PATTERN WAS BUSY. ACTIONS: AFTER BLOCKING IN THE CAPT SPOKE WITH FAA TWR CTLR MS F. THE CAPT ASKED MS F IF THERE WERE ANY PROBS WITH ACR A RADIO XMISSIONS. NO PROBS WERE NOTED EXCEPT THAT THEY HAD BEEN VERY BUSY. THE CAPT SPOKE WITH MS F AGAIN AT APPROX XX40Z AFTER WE RECHKED OUR RADIOS. THE CAPT AGAIN ASKED IF THERE WERE ANY PROBS WITH ACR A RADIOS ON APCH CTL; TWR; OR CLRNC TO LAND. SHE SAID THERE WERE NO PROBS. AGAIN SHE SAID THAT THEY (THE TWR) WERE VERY BUSY AND HAD RECENT PROBS WITH SOME RADIO SENSORS AROUND THE FIELD.