nonscheduled

[ non-skej-oold, -oo ld, -oo-uh ld; British non-shed-yoold, -shej-oold ]
/ nɒnˈskɛdʒ uld, -ʊld, -u əld; British nɒnˈʃɛd yuld, -ˈʃɛdʒ uld /

adjective

not scheduled; not entered on or having a schedule; unscheduled: nonscheduled activities.
(of an airline) authorized to carry passengers or freight between specified points as demand warrants, rather than on a regular schedule.

Origin of nonscheduled

1945–50, Americanism; non- + scheduled

British Dictionary definitions for non-scheduled

nonscheduled
/ (nɒnˈʃɛdjuːld, esp US nɒnˈskɛdʒʊəld) /

adjective

not according to a schedule or plan; unscheduled
(of an airline) operating without published flight schedules