36. A functional airspace
block ð that extend across the airspace under the responsibility of more than one Member State ï shall only be established by ð joint designation ï mutual agreement between all the Member States and Ö ,as well as Õ , where appropriate, third countries who Ö that Õ have responsibility for any part of the airspace included in the functional airspace
block ð The joint designation by which the functional airspace
block is established shall contain the necessary provisions concerning the manner in which the
block can be modified and t
...[+++]he manner in which a Member State or, where appropriate, a third country, can withdraw from the block, including transitional arrangements ï.