we ll show you how to track sharks as some beaches temporarily close. crime without punishment: our cbs news investigation takes to us chicago where some murder cases are closed, even when no suspect is charged. and on the road with a birthday surprise that will help you savor what it means to be an american. this is the cbs evening news with norah o donnell, reporting from the nation s capital. garrett: good evening, to our viewers in the west, and thank you for joining us on this friday night. tonight the fourth of july holiday weekend is off tie hectic start as the nation matches pre-pandemic travel numbers. airlines and passengers worry about potential snarls thanks to staff shortages and larger-than- expected crowds. long lines and short tempers could ruin some independence day celebrations. airlines are urging their customers to check their flight status before heading to the airport. now, so far today, there have been more than 500 cancellations and 5