For Gander, the departure clearance will be the oceanic clearance unless it is modified by ATC. The aircraft shall NOT change the route unless ATC clears it for the route change.
Effective July 11, 2026, when a reroute is required, Gander Domestic FIR (CDQX) will resume issuing CPDLC amended route clearances [CLEARED TO (position) VIA (route clearance)] before an aircraft reaches its Oceanic Entry Point (OEP). The route may be issued by Gander Domestic FIR (CDQX), Moncton Domestic FIR (CZQM), or Montreal North Domestic FIR (CZUL).
Gander Oceanic FIR (CZQX) will continue to issue CPDLC amended route clearances once an aircraft is past its Oceanic Entry Point (OEP).