A total solar eclipse, an uncommon astronomical event causing temporary daylight darkness due to the moon obstructing the sun's rays to Earth, last occurred in the US in 2017. The upcoming eclipse is unique as the next one is not expected until August 2044.The FAA's bulletin highlights the "possible impacts to air traffic and airports along the eclipse path" from April 7 to 10, attributing potential disruptions not to the eclipse's darkness but to elevated air traffic levels, a Newsweek report said.