[Dr. Eckleburg]

The digits of the transponder only go up to 7. Therefore, 7777 would be the highest number the transponder can go.

Thanks for that information. It would be interesting to learn if the same number of passengers who started the flight complete it after the plane's Canadian sojourn.

[Mark17]

It would be interesting to learn if the same number of passengers who started the flight complete it after the plane's Canadian sojourn.

Interesting question indeed. It seems to me, if the pilot says everything is OK, he immediately changes the transponder code. From what I can gather, this did not happen.