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: 21 TO 22 WEEKS IN ADVANCE You may already be too late to score a cheap flight to Europe this summer. The booking window for the cheapest tickets has moved further out, from 11 or 12 weeks in advance in 2009 to 21 or 22 weeks in 2011. (Average round-trip fares rose to about $1,500 last year from $1,100 in 2009; this yearâs outlook is no better.)