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.
Thatâs good news in terms of how much lead time youâll need to buy tickets. While domestic flights arenât always cheaper than international, they do offer the ability to book closer to your trip for less: When youâre booking a domestic flight, book your tickets between one and three months prior to your trip. According to Travel & Leisure, Kayak compiled one year of flight data and discovered the following: âSix months before departure, domestic ticket prices were about 20 percent higher than the lowest fares.