vols commerciaux réguliers, vol non régulier, vol à la demande, vol à la demande, vol non régulier, OPS, vols commerciaux du trafic hors des lignes, vol régulier, service régulier, service disponible aux heures des vols réguliers, HS, . -*- scheduled commercial air transport, non-scheduled flight, non-scheduled operation, off schedule flight, non-scheduled operation, OPS, unscheduled flight, non-scheduled commercial air traffic, scheduled flight, scheduled service, service available during hours of scheduled operations, HS