bring in not only the threat for flooding, but also the threat for severe weather. once again, rosemary alright, brutally ritz, many thanks for keeping a very close eye on all of that activity. appreciate it well, spring break. air travel is underway, but the potential for flight delays is causing concerns. experts say us passengers should now arrive. at the airport three hours ahead of their domestic flights. cnn's pete montaigne has more. spring break. travel is soaring back to normal and renewing maury that your flight could be canceled. meltdowns plagued the faa in january southwest airlines over the holidays and industrywide last summer air travel system is under great stress. the federal aviation administration is already warning of a shortage of air traffic controllers that could cause increased delays at new york's three major airports this summer. they're a key air traffic control facility is that only 54% staffing. we're seeing delays. seeing with cancelations