By Steve Hatch Wizz Air recently announced an “all you can fly” offer for £534 per year. It’s a splashy move, and it’s provoked some scepticism among industry analysts. But will it prove a hit with air travellers? Data from YouGov Surveys shows that just over a third of Britons who have travelled by air (36%) would be interested in paying a fixed fee for unlimited flights – rising to 47% of Britons who fly once a year, and three in five (57%) Britons who travel at least once every few months. When asked about Wizz Air’s subscription offer, opinion changes – but there is still clear interest fr…