Originally Posted by Nikko5

EXT is my local airport & I use it regularly. I think physically a B2B on Loganair would be a bit tight here, to be honest. Tomorrow's GLA arrives at 11.25 and departs again at 11.55. Although EXT is small, there is no airside transit. You would be unlikely to have much of a queue for security at that time and Loganair don't seem to publish a gate closure time, but there must be one before take-off time! Then again, they will still let you check in a bag up to 30mins before departure. Personally I have a fairly high risk tolerance but would probably not attempt this! There is an EDI departure 25mins after GLA (which could be your backup plan!) but obviously would be a different aircraft.

As for boarding pass, I've not specifically done a BA codeshare on LM, but I would anticipate online check-in would most likely be done on the LM web-site/app - as operating carrier - rather than BA.