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.
That brings us to the 54 days. For a study published in February, the booking site CheapAir.com looked at millions of trip combinations, searching as far as 320 days in advance to one day prior to departure and every possible day between. Thatâs 1.3 billion airfares. The result: 54 days in advance was the best time, on average, to buy domestic tickets. This is not a hard-and-fast rule, however. Airfares to popular vacation destinations tend to go up sooner.