You can temporarily disable W10 updates by disabling WU (Windows Updates) and WUDO as here:
Windows Update Delivery Optimization: FAQ
just prior to your flight.
Not guaranteed to work, as there are still issues with the latest version (
W10 v1607) still allowing updates to come through anyway.
You can also mitigate the chances of updates coming through by not scheduling your flights on Tuesdays, as that's the days that the weekly W10 push updates are distributed by Microsoft servers. That may not always be possible if you are flying on business or have a miles-award flight which you can only cash in on Tuesdays, but if you can schedule on any of the other 6 days of the week, those updates are a lot less likely to...