I recently used this website to check me in for a flight and it worked like a charm. It's called swcheckinbot [dot com] and it auto checks you in 24 hours in advance for free.

Maybe this is useful for others as well. Enjoy!

[​​​​mod: https://webparanoid.com/en/check-web...heckinbot.com] finds nothing to like and several things not to like.]