nonscheduled
non·sched·uled
(nŏn-skĕj′o͞old)adj.
Operating without a regular schedule of passenger or cargo flights: a nonscheduled airline.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
nonscheduled
(ˌnɒnˈʃɛdjuːld) (esp US ˌnɒnˈskɛdʒʊəld)adj
1. not according to a schedule or plan; unscheduled
2. (Aeronautics) (of an airline) operating without published flight schedules
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
non•sched•uled
(nɒnˈskɛdʒ uld, -ʊld, -u əld; Brit. -ˈʃɛd yuld, -ˈʃɛdʒ uld)adj.
(of an airline or plane) authorized to carry passengers or freight between specified points as demand warrants, rather than on a regular schedule.
[1945–50, Amer.]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.