By Guy Taylor Ryanair will list its flights with long-running travel agent adversary On the Beach, despite a history of disputes and legal skirmishes. In a statement on the London Stock Exchange, On the Beach said the agreement represented a “transformational shift” in its relationship with the low-cost carrier. OTB customers can now access the Irish airline’s low fare flights as part of their holiday packages, alongside the company’s flexible payment plans, customer perks and ATOL protection. It comes after three deals between Ryanair and online travel agents (OTAs) in recent months, which re…