Algeria has closed its airspace to all Moroccan civil and military aircrafts, the Algerian presidency has said.
The move was announced "in view of the continued provocations and hostile practices on the Moroccan side", according to the statement.
This comes less than a month after Algeria cut diplomatic relations with Morocco.
The decision was arrived at after a meeting of the High Security Council chaired by President Abdelmadjid Tebboune.
The move will only affect 15 weekly flights, which link Morocco with Tunisia, Turkey and Egypt, a source at Royal Air Maroc (RAM) is quoted by Reuters news agency as saying.
The source described the impact on RAM as "insignificant" and said the relevant flights could reroute over the Mediterranean.