Yes...
With ZED, it eliminates the need for back ups.
I have used ZED since 1996 without any issues.
My first ZED was in July 1996, Air France, SFO-CDG.
The flight was full and so I used it on VS for a SFO-LHR flight.
I have used many ZED tickets for different routes and airlines than were on the ticket and never had anybody question it.
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