I think what Expiditer means by "on schedule" is in the same context that an airline flight is "on schedule".
I.E.
"We are pleased to announce that NERC will land on time in 6 months"
followed by
"We regret to announce a delay to the arrival of NERC, this is due to ATC delays at LATCC, and the expected time of arrival is 9 - 12 months, on behalf of the owners we apologise for this delay and any inconvenience it may cause"
and
"This announcement is for those of you expecting the arrival of NERC. We regret to announce that this project has been delayed for unforseen operational reasons. Please report to Aviation House for a complimentary
slip of paper allowing you a temporary transfer to the North Sea wings"
