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Discover the secret to snagging the cheapest airplane ticket: It all depends on the day. LightField Studios / Shutterstock.com
Holiday travel season is right around the corner. If you have not booked your flights yet, you should not wait much longer. But if you have the luxury of taking your time to plan a future trip, booking your flight on a Sunday might help you save a bit of cash. Travelers who book on Sundays save up to 13% on their flight, on average, compared to booking on the most expensive day…