why does the narrator say i landed and was not sorry to walk away from the old dakota

The narrator says, "I landed and was not sorry to walk away from the old Dakota" because flying the old Dakota was a terrifying and challenging experience due to bad weather and equipment failure. After managing to land safely, the narrator felt relieved and grateful to be out of danger, so he was not sorry or regretful about leaving the plane behind. The experience flying the old Dakota was so frightening that the narrator was just glad to have landed safely, even though he could not thank the mysterious pilot who had helped him. This sense of relief and safety outweighed any attachment to the plane itself, hence he was not sorry to walk away from it.