 I'm Heather Bosch. This may be one of the busiest travel days in years, with Americans heading home from 4th of July festivities. Advice from this traveler in Los Angeles. Definitely come early. Don't try to cut it an hour before your flight. Come like two hours before your flight. Elise Martinez reports from LAX. More than 3 million people expected to be screened at airports across the country today. LAX officials say the TSA is expected to screen about 241,000 people here.