Last year I went to QAS to postpone the date from Doha - Mumb. They asked me to pay Penalty around 200 QR. I was surprised wen i heard this. I think QAS only charging for postponing the dates. Other air ways Gulf ,Emirates or others or not charging.So most of the people are prefering to use Gulf air or Emirates or others.They can postpone the travel dates with free of cost. If QAS also follow like this its very useful for all. The QAS service is nice