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.
This is the best time to buy a plane ticket. If you're looking to get the best price on airfare, start shopping nearly eight weeks before you plan to leave. The best time to buy domestic airplane tickets in 2015 was 54 days in advance, according to a report from CheapAir.com that analyzed almost three million itineraries. But be warned: it's not an exact science.