There is no logic to this argument in my opinion.
Fuzzy14 said the cost of crude oil has halved in the last year. No dispute - fact.
So oil using companies are now stock piling at this low price. Therefore without fail, the price of air fares should therefore come down once they start to use this cheap oil.
Will it happen? - of course it wont
Had the cost of oil gone up in price as it did a while back, then prices would have increased immediately as happened when the dreaded fuel surcharge was introduced.
Agree all the 'suppliers' mentioned by pjh are in business to make a profit but surely us consumers should expect a more 'fair' playing field. However for as long as they continue to get away with it, nothing is going to change.
Finally if the petrol stations can pass on the price of cheaper fuel to us, then so can the airlines. Let's be realistisic, the suppliers & retailers of oil are still making very nice profits otherwise they wouldn't be selling fuel near 30p a litre cheaper than this time last year!