Most places will honour a gift voucher after expiration if the weather has genuinely played a large factor in the lesson not going ahead. However, if someone calls up with a voucher with only two days left to expire, expecting us to turn somersaults with a super-packed schedule of regular students then they're expecting a bit much but we generally try to work around it for which we often get little or no thanks.
Ignorance is often played upon when in reality most honest people will admit they've simply forgotten about the gift or as is also often the case, been too scared to use it! The 'good ole boys' impression people have of genuine flight training businesses is rather antiquated these days because at the end of the day it's a business like any other. I won't expect the Esso garage to honour my 2p/litre voucher after it's expired - why do people think that we're any different?!
VFE.