United Airlines and Expedia Group reached a deal to continue online ticket sales, ending a standoff in which the airline had threatened to withdraw from one of the internet’s largest travel sellers. The agreement covers a multiyear period, the companies said Monday without specifying how long it would last or disclosing other terms. United, which had said it would withhold fare data from Expedia starting Sept 30, disclosed last week that the two parties were discussing a new contract. Airlines and ticket sellers have tussled for years over distribution costs as the carriers have sought to sell more of their own tickets directly to customers. Expedia sued United in February in federal court in New York alleging that the airline had breached a 2011 contract. <br/>