Lufthansa has cancelled more flights for the summer than any other European carrier . The German airline has grounded at least 20,000 departures, mainly through the shutdown of its regional subsidiary CityLine. Under air passengers’ rights rules, customers should be offered alternative flights. But one Scottish passenger has been refused a replacement – with Lufthansa offering only a refund or postponement of the journey. Rhona Taylor was booked to fly in June on Lufthansa from her home city of Glasgow to Frankfurt. This is one of the routes that the German airline has trimmed in response to the high price of jet fuel. Her outbound flight was replaced by a departure from Edinburgh to Frankfurt on the same day. Lufthansa is required to pay for the additional transport cost. But her return flight is simply shown as cancelled, the only options offered were “request refund” and “use ticket later”. The airline told her: “We have had to make some adjustments to our flight schedule.…