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.
LAST YEARâS SWEET SPOT: 11 OR 12 WEEKS In 2009 and 2010, the cheapest airfares went to procrastinators who purchased tickets just two weeks in advance at a saving of about 8 percent. But last year, the pattern took a sudden shift, with the cheapest tickets bought much further ahead.