Upvote:-1
Depends on the airline. E.g., checking in online or offline will prevent the passenger from making any free change to their flight with VivaAerobus. From their terms and conditions:
Said changes may only be made until 4 (four) hours before the time scheduled for the Service, provided your boarding pass has not already been created.
This made me wonder What's the point of checking in several days before a flight? (tldr: early check-in helps avoid missing the flight since VivaAerobus notoriously overbook them. When I missed my flight last Christmas because of overbooking, the airline employee confirmed it.).
Upvote:3
Yes, it is absolutely possible to make changes after checkin. The catch is, you can't just do this self-service, once you've been checked in you will almost certainly need assistance from airline staff to make any changes.
Since the plural of anecdote is data, a couple of cases where I've had my flights changed after checkin, from pedestrian to more unusual:
Finally, the story you mention that made the rounds in 2014 involved somebody supposedly using the China Eastern first-class lounge in Xi'an over 300 times in one year. Sadly if unsurprisingly, it has been debunked, China has strict security at airports and the article claims that no changes are allowed once your physical boarding pass is issued. As noted above, this is actually false, but what is true is that they would not have been able to quietly change their flights by themselves, and they certainly would have been noticed if they had asked staff to make changes 300 times in a row!