Wiktionary
nonscheduled
a. Not scheduled; not according to schedule.
Usage examples of "nonscheduled".
All we knew was that a week before the great day, a nonscheduled rocket came up to orbit with Gregory Wendell aboard.
The landing itself was without incident, but the nonscheduled airline operator who owned the plane they were flying was evidently becoming alarmed.
Any vessel making a nonscheduled arrival was to be searched and all persons aboard required to furnish documentation.
The fairies made plenty sure that those kids knew just whom to thank for that nonscheduled flight.
Kirk was forced to order a nonscheduled lay-over for repairs at Star Base 11, a huge complex serving the dual role of graving dock and galactic command outpost.