Travelers are already filling LaGuardia Airport before sunrise as the Thanksgiving travel rush gets underway. The Transportation Security Administration says this week could be one of the busiest holiday travel periods in its history. TSA expects to screen more than 17.8 million people nationwide from Tuesday through Dec. 2. Officials say Sunday, Nov. 30, when many Americans head back home, could break records again, with more than 3 million travelers in a single day. At LaGuardia’s Terminal B, lines started forming early Tuesday morning as flyers tried to beat the rush. TSA says it’s seeing a daily jump of about 14,000 more travelers per day compared to last year. The agency is reminding passengers to:

AAA also expects a record-breaking Thanksgiving week across all types of travel. The group projects that 81.8 million Americans will travel at least 50 miles from home this holiday period, with the vast majority — 73 million people — hitting the road. For now, things are moving smoothly at New York airports. Travel experts say lines and traffic will continue to build through the day and into the holiday weekend.