The heavy spring break travel season will be followed by an influx of passengers headed to various states to see the Great North American Eclipse. The combination will likely bring heavy delays in air traffic, according to the Federal Aviation Administration.

The FAA expects spring break travel to peak with 50,670 flights on April 4 and 48,904 flights on April 5. While most travelers will be heading to vacation destinations, a “significant number” are expected to head to areas with the best eclipse views, the FAA said. Fifteen states – Texas, Oklahoma, Arkansas, Missouri, Illinois, Indiana, Ohio, New York, Pennsylvania, Vermont, New Hampshire and Maine, as well as small parts of Kentucky, Michigan and Tennessee – are along the path of totality that will experience the greatest periods of darkness as the moon blocks out the sun.

The eclipse will be visible to varying degrees across the contiguous U.S. from 1:30 p.m. CDT to 2:40 p.m. CDT.

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Travelers should be braced for impacts due to the eclipse, FAA said in a statement.

“Travelers flying along the eclipse path may encounter limited parking and potential delays at airports due to the high volume of aircraft and drones attempting to witness the total solar eclipse,” the agency said.

The FAA is warning pilots to be aware of possible impacts to air traffic and airports along the eclipse path. As for passengers, it’s best to “be patient, give themselves extra time at the airport, and pack safely,” the FAA said.

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In particular, passengers are advised to:

• Pay close attention to what’s in your bag. Some common toiletries that passengers pack could be hazardous. Check your bags for aerosol cans that may contain hair spray, deodorant, tanning spray or animal repellant, nail polish, artist paints and glues.
• E-cigarettes, vaping devices, and spare lithium batteries are not authorized to be packed in checked luggage. Spare lithium batteries – the kind that are found in personal electronic devices and back-up charging devices – can only travel in carry-on baggage.
• Electronic devices powered by lithium batteries can catch fire if they are damaged or have exposed electrical terminals. The FAA recommends that passengers keep cell phones and other devices nearby in the cabin to quickly access them if necessary.