Will this trick work to extend a free travel voucher?

I won a pair of airline tickets last year, or actually a prize
voucher, enabling me to travel anywhere in the US that American
Airlines flies.

The voucher however buys a quite restricted class of seats, and I have
been unable to book travel for a time convenient with my schedule.
The deadline for using the voucher is approaching and I don't think
I'll be able to use it now, as there are no available seats for dates
that I would want to be flying.

A friend suggested that I might book flights using the voucher, for
whatever date the airline can accommodate me, then once booked, call
American and reschedule for a date in the future (beyond the
expiration date). She said that she'd had a restricted voucher once
(I think for being bumped from a flight) and was able to get a flight
after the voucher's expiration by doing this.

Sounds almost too good to be true though. Does this technique work?

In article <us9kr318b6406jhua3o0akfg6lctokedtp.DeleteThis@4ax.com>,
someone.DeleteThis@somedomain.com wrote:

> I won a pair of airline tickets last year, or actually a prize
> voucher, enabling me to travel anywhere in the US that American
> Airlines flies.
>
> The voucher however buys a quite restricted class of seats, and I have
> been unable to book travel for a time convenient with my schedule.
> The deadline for using the voucher is approaching and I don't think
> I'll be able to use it now, as there are no available seats for dates
> that I would want to be flying.
>
> A friend suggested that I might book flights using the voucher, for
> whatever date the airline can accommodate me, then once booked, call
> American and reschedule for a date in the future (beyond the
> expiration date). She said that she'd had a restricted voucher once
> (I think for being bumped from a flight) and was able to get a flight
> after the voucher's expiration by doing this.
>
> Sounds almost too good to be true though. Does this technique work?

Is there some reason you don't call American Airlines to ask if they
would allow this?