1 Ã Van de Graaff generator 1 Ã electrically-insulating stool Some confetti, or aluminium foil, or foil cake trays. The demonstration. This demonstration involves high voltages, and so it should never be done by anyone with a pacemaker or other internal electrical device, or who thinks they might be pregnant.
Minimum Advance Purchase. Airlines increase prices dramatically 14 days and 7 days before departure, respectively, according to figures analyzed by FareCompare. To avoid these sharp spikes, you should aim to purchase your ticket a minimum of 15 days prior to departure. Air travel experts at FareCompare say that the window for purchasing tickets at the best price is between three months and 14 days in advance.
However, Filip Filipov of Skyscanner advises that while five weeks is the average, the optimum time to book your flight can vary significantly between destinations. Price patterns can vary by type of airline and between short and long haul travel, so is very much destination dependent.. The best time for flights to Turkey, for example, is 13 weeks before departure, while the US should be booked five months (21 weeks) ahead. Skyscanner's research covers scheduled and low-cost flights (charter flights represented less than 1.5%), and is contrary to the advice given by most industry experts who say, when it comes to full-service scheduled flights, the golden rule is the earlier the better.