BLs (Bestemmelser for Luftfart) BLs (Instructions for Airtraffic) is the law document for flying in Denmark instructing how to fly. It is a gathering of law documents that sets the required standards for pilots, however it is identical to ATC rules, and hence a great source of learning the correct rules. BLs will tell you: Rules concerning flying General laws concerning controlling, such as airspace, clearances, etc. General approved Phraseology ATS Instructions will NOT tell you: Local regulations Tips and tricks Anything VATSIM related Controller specific rules  There are many of these documents so we have done you a favor and included the relevant ones and highlighted all that is considered relevant for VATSIM. The documents should be studied as you are waiting to commence Pre-Training (1st Stage). Later once you start training the Pre-Training course will reference these documents from time to time.