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All across the U.S., bargain-hunters are turning to flight calendars with renewed hope. Airlines such as Delta Air Lines (DL) and American Airlines (AA) show deep fare drops weeks before holidays.

With airline prices fluctuating more than the stock market, here are some proven hacks for travelers to book cheap flight tickets.

Google Flights introduces a game-changing update that reveals the cheapest travel options, transforming how budget-conscious travelers book their flights worldwide.