An OLDI coordination message satisfying the following operational requirements: Replace the verbal boundary estimate by transmitting automatically details of a flight from one ATC unit to the next prior to the transfer of control; Update the basic flight plan data in the receiving ATC unit with the most recent information; Facilitate distribution and display of flight plan date within the receiving ATC unit to the working positions involved; Enable display of correlation in the receiving ATC unit; Provide transfer conditions to the receiving ATC unit.