No flux capacitor needed: Seven flights that took off in 2018 landed in 2017, according to FlightRadar24, which tracks flights around the world.
FlightRadar24’s website noted on New Year’s Eve that six flights — all departing from Taiwan Taoyuan International Airport in Taipei — were leaving after the stroke of midnight local time on January 1 but were arriving at their destinations in North America before midnight on December 31.
Another flight — Hawaiian Airlines Flight 446 — was due to leave Auckland, New Zealand, at 11:55 p.m. but was delayed about 10 minutes, putting it into the new year. It arrived in Honolulu at 10:16 a.m. on December 31.
So it really isn’t the same as “Back to the Future,” because in the movie they were actually flying back to the past — but these planes were presumably flying forward, which makes that really confusing, because well, physics. And anyway, who wants to go back to 2017?