CABIN ATTENDANT RPT; S80; DFW-SLC. PAX IN FIRST CLASS NOTICED A WINDOW CRACK WHICH HE BELIEVED WAS GROWING. DIVERT TO SLC FOR MAINT CHK. DETERMINED SAFE TO FLY TO SFO. NORMAL LNDG.

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SHORTLY AFTER COMPLETION OF THE MAIN CABIN MEAL SVC; FLT ATTENDANT #1 CAME BACK TO INFORM US THAT WE HAD DISCOVERED A POSSIBLE CRACK IN A FIRST CLASS WINDOW AND WOULD POSSIBLY BE DIVERTING TO SLC. I WALKED UP TO FIRST CLASS TO OBSERVE AND SAW WHAT APPEARED TO BE A 'SCRATCH' ON THE WINDOW BTWN XA AND YA. PAX IN YA HAD TOLD FLT ATTENDANT #1 THE CRACK HAD GOTTEN LARGER AS FLT CONTINUED. FLT ATTENDANT #1 INFORMED THE COCKPIT; WHO ALSO CHKED. IT WAS DECIDED WE WOULD FIRST FLY AT A LOWER ALT; BUT LATER THE COCKPIT DECIDED TO DEVIATE TO SLC TO HAVE A MECHANICAL CHK WHEN IT APPEARED THE CRACK WAS GETTING LARGER. WE DID DIVERT TO SLC. FLT ATTENDANTS PASSED OUT MAGAZINES; CONTINUED TALKING QUIETLY TO PAX; ANSWERING QUESTIONS AND MAKING EVERY EFFORT TO KEEP PAX CALM. WE LANDED AT XB05 WITH NO APPARENT HARM TO PAX. MOST WERE ONLY CONCERNED THAT THEY WOULD ARRIVE LATE TO SFO. THE MECHS CHKED THE WINDOW; DETERMINED THE CRACK WAS ON THE INTERIOR WINDOW (THESE ARE DOUBLE PANED ACRYLIC WINDOWS ON THIS MD80); AND AFTER DISCUSSION WITH COCKPIT AND OTHER APPROPRIATE PERSONNEL; DETERMINED IT WAS SAFE TO CONTINUE ON THE PLANE TO SFO. WE DEPARTED SLC AT XX00 AND ARRIVED SFO AT XX36. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THAT THE PAX; SITTING AT WINDOW SEAT YA; SAW THE CRACK GROW WHILE THE PAX IN FRONT OF HIM IN SEAT XA DIDN'T SEE THE CRACK GROW; AND THOUGHT IT WAS A FIGMENT OF HIS IMAGINATION. SINCE IT WAS A PAX INSISTING THAT THE CRACK WAS GROWING; SHE BELIEVES THE COCKPIT DECIDED TO APPEASE HIM AND GO AHEAD AND DIVERT TO SLC TO HAVE IT CHKED BY A MECH. THE WINDOW WAS CHKED RAPIDLY; SO THEY DIDN'T INCUR A GREAT DELAY IN SLC.