I've heard on my friends who work at an Airline that people use to buy the cheapest ticket they have for the coming months and use it that day to become eligible as chance passenger. Just want to know if this is a myth or a fact?
closed as unclear what you're asking by Michael Seifert, David Richerby, Michael Hampton, Giorgio, Ali Awan Dec 8 '18 at 8:41
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Assuming you mean "stand by" than the answer is "typically no, but it depends and it's complicated"
Changing the date of flight for a non-flex ticket will incur a change fee and these days most airlines are pretty strict about collecting these. It depends on the type of ticket, airline policy and your status. United, for example, allows taking a different flight that's close in time to the original flight for free if your status is Gold or higher.
Other exceptions are flex tickets, people that have employee or family relations with the airlines, cases where the new fare is substantially cheaper than the original one, etc.