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.
Tips to Save on Travel to Madrid. Advance booking is the best way to get cheap flight to Madrid. Book 40 to 25 days in advance to grab cheap flights. Airlines such as Air Canada, Air China and American Airlines offer good discounts on airline tickets. Catch the 24-hours express bus service to reach downtown.