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If it’s only flights you’re looking for, Jet2.com are offering 10% off all Summer 2021 flights.
Source : https://www.thetravelmagazine.net/jet2holidays-are-offering-100pp-off-for-the-first-50000-holiday-bookings/
Source : https://www.thetravelmagazine.net/jet2holidays-are-offering-100pp-off-for-the-first-50000-holiday-bookings/