Yes, you can safely do your CBD’s but it’s the alcohol that maybe the problem. Using CBD’s and then drinking alcohol is okay but alcohol impairs your judgment in a time of crisis in case something does happening on the airplane. In the crisis if you have alcohol in your system and you are in the air the alcohol is much stronger and you are very likely to be impaired even with one drink but it is not the CBD’s that are the problem. One reminder though the airline is federal space and all cannabis (possession and consumption) is considered illegal in federal space.
Happy safe travels!