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.
The short answer: Seven weeks before takeoff. On average, fares bottomed out 49 days before the flight, then increased slightly, but remained steady until about a month out. After that, prices climbed as the travel date approached. But too much advance planning isn't good for the bottom line, either. Though, not surprisingly, the highest fares, came with bookings made 11 or fewer days in advance, the next worst timing was 208, 209, and 210 days out, according to the analysis.