# How to interpret flight schedule data from before 1987

I'm trying to interpret schedule data from before 1987 (see example).

Example line:

          🡓                                                                                                         🡓
20100001409B000 033504140079100000000000000000D004BOSJFK  RC0970AS     1234567  0535 BOS 0654   JFK RC 970 YQ   CVR 1           \


I'm trying to understand if this flight represents a direct flight. Specifically, my understanding is that the 9B (byte 11-12) indicates that it is a "certified direct flight". However, the 1 (byte 117) after the CVR (bytes 113-115) seems to indicate the number of stops, here more than zero. I'm trying to figure out what it means if a direct flight has stops. Some of these "certified direct flights" in my data have more than 4 stops on a short route that would not have needed a refueling stop.

Does anyone have experience in interpreting these older schedule files?

• There is a distinction between a direct flight and a non-stop flight. Is that the source of the confusion? Sep 27 at 9:38
• In short, direct flight means one flight number, nothing else. In particular, and somewhat counter-intuitively, it doesn't mean no stop or even no change of aircraft. Sep 27 at 9:46
• Is this by any chance a crew roster/schedule? Sep 27 at 16:22
• @NeanDerThal, it is a set of information about scheduled flights.
– user313233
Sep 28 at 11:26
• From which tool/system does that come from?
– mins
Sep 28 at 18:50