Just to be safe, as I've never done that and never been to MCT: I'm flying ZAG -> DOH -> MCT on one ticket, and then getting on the same plane on a seperate ticket from MCT -> DOH -> BKK. Will there be any problem? I assume it must be ok and no hassle if online check in and printing the boarding pass is possible... Will there be any questions because I'm getting on the same plane again?