Online check-in Citywing - https://www.check-in.site

I apologize for the confusion, but as of my knowledge cutoff in September 2021, Citywing, a regional airline based in the Isle of Man, ceased operations in March 2017. Therefore, there is no online check-in available for Citywing flights as the airline is no longer operational.

However, please note that the aviation industry can undergo changes, and it's possible that new developments have occurred since my last update. I recommend checking with the relevant authorities, airline websites, or contacting other regional airlines for up-to-date information on online check-in procedures.