A frequently traveling Russian woman advised to book a seat on the plane a day in advance 
A frequently traveling Russian woman revealed two ways to get the best seats on the plane for free. She shared her tricks in her personal blog on the Yandex.Zen platform.
The author of the blog recalled that some airlines allow passengers to independently choose a seat during online check-in, which opens a day before. “Set your alarm exactly one day in advance, study the plan of the plane in advance – and quickly book the right [seat]!” – advised the Russian woman.
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Another option is suitable if, during check-in, the system itself distributes seats among passengers. The girl recommended to go through the procedure closer to the time of departure – according to her, the most unpopular places are given out first, and the “good” ones remain for later.
you have been given, then you can click the “complete” button, and in an hour and a half to go through the registration again. Your seat becomes vacant and you have another chance to get something better, “the traveler recommended.
Earlier in October, a British blogger revealed a way to get an extra seat on the plane for free. So, during online registration, you must select two seats on the 13th row: one in the aisle, the other at the window, leaving the seat in the middle free. According to the girl, most passengers will not want to sit between two strangers. In addition, due to superstition, many people are afraid to book a seat on this row.