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.
2. Buy at the Right Time. Knowing when to buy your flights can be the best tip for saving some serious cash on your next trip. We did a study last year and found that for domestic flights 49 days (about 7 weeks in advance) was, on average, the optimal time to buy plane tickets. But that number can vary quite a bit depending on where and when youâre going.