double-blind study - an experimental procedure in which neither the subjects of the experiment nor the persons administering the experiment know the critical aspects of the experiment; a double-blind procedure is used to guard against both experimenter bias and placebo effects.
No they get more expensive, airlines will always advise you to book in advance to take advantage of their best fares. Sometimes they do a special deal but not within a week of flying. I would try another airline or make different plans.
The Best Time To Buy Airline Tickets. It pays to know when, and when not, to buy airline tickets. Airlines make money by anticipating our buying habits. It's a complicated process, but you can save money if you know when to buy airline tickets. Travel agencies can also help you find cheap airline tickets when flying by using insider secrets to your advantage. Editor's note: This is an updated version of an article originally posted on June 12, 2014. Sources: