Under the policy, Logan customers who were stranded could request a reimbursement for any parking charges that resulted from unexpected extra days spent away from Boston. Logan was under no obligation to provide the rebates. But it was a generous move that showed respect for customers who had already been through an ordeal. It’s especially encouraging because the airport has not always been distinguished by its attention to customer service. Massport’s decision was a welcome sign that it’s changing for the better.