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...Template letter of procedure agreement lop loa between area control centre and preamble the authorized representatives agree that procedures contained in this document shall remain force from effective date specified until either amended or cancelled supersedes cancels existing letters dated provisions be implemented on at utc objective is to specify co ordination scope herein are supplementary icao standards recommended practices annexes for air navigation services regional doc they detail conditions under which responsibility provision traffic transferred ats units mentioned paragraph above also formalises delegation vice versa within those portions airspace lie fir boundaries agreed points transfer as defined establishment based operational considerations only does not therefore contribute neither can it invoked any other purpose beyond context amendments change including its cancellation replacement requires consent concerned applies substance well applicability made a meeting two ...