- Hey there! The customer service at Delta Airlines SEA Terminal is excellent. The personnel is welcoming, competent, and always willing to assist, from check-in to boarding. They manage everything with a grin, even at hectic times, which makes the experience easy and stress-free. They can help you with everything from luggage assistance to answering a brief query. Seeing a crew that actually cares about passengers is refreshing. Taking a Delta flight from SEA? You're in excellent care!