Many times Airlines mistakenly file bytes 64-67 which can lead to pricing being allowed where the Airline intended to restrict it to an Advance Purchase.
This field is used to indicate that the ticketing requirements are only applicable if reservations are made by the time specified. The Exception Time is a match field, and the data specified within the Record 3 table will only apply if the reservation time matches the Exception Time. Application of the Exception Time is an exception to Record 2 string processing. When the Exception Time is coded and matched (and the Override Date Table is also matched) processing must pass or fail on that table. Processing cannot read on to any other tables.
