Given the rather bleak outlook for S21 I'm wondering...if I've already purchased a flight using a voucher can I cancel and elect for another voucher or do the funds just return to the original voucher code? It appears if I rebook for dates beyond 31 Dec 21 I'll incur a change fee which I understand but who knows if we'll be able to fly in 2022! I'd rather sit on my existing credits...( >€1500) than continue to incur more charges.