The Danish transport authority Trafikstyrelsen has decided to temporarily ground all Boeing 737 Max 8 and 9 aircraft.
The grounding came into effect yesterday at 20:00 Danish time.
Cause still unknown
The measure was taken as a response to a crash in Ethiopia on Sunday that saw all 157 people on board a Boeing 737 Max 8 killed.
Another fatal crash at the end of October in Indonesia with the same type of aircraft cost 189 people their lives. Both crashes occurred shortly after take-off.
Up to now aviation experts have not been able to discover the cause of the crashes.
In taking this step, Denmark is following a number of other countries and a recommendation from the European Union Aviation Safety Agency.