British Airways and U.K. regional carrier Loganair have expanded their codeshare agreement, adding 18 new routes for customers traveling in the United Kingdom, the companies announced Tuesday. The additional routes mean BA customers have access to 38 of Loganair's U.K. routes, which can be booked on the BA website. In addition, they also can earn Avios and Tier points on the Loganair routes as part of BA's Executive Club loyalty program.