Sub-load tickets
Sub-load tickets are flight tickets available to airline employees and some family members, usually at a substantial discount ranging from 50% to 90% of face value (AKA ID50, ID90, etc.). The discount varies according to employee grade and also by airline. Sub-load tickets are essentially standby tickets, meaning that passengers with these tickets will be bumped if the plane is full or the weight limit is exceeded. Sub-load tickets are the preferred employee ticket types for several Asian and Middle East airlines such as Singapore Airlines, Emirates, and Qatar Airways.