You can use the Save as command to save individual messages in Text or HTML format. To save multiple messages, you'll need to use VBA or a utility. See Tools for a list of utilities that can automate the process and save messages in a variety of formats.
For a small fee, Southwest Airlines' Early Bird Check-In allows passengers to check-in to a flight automatically up to 36 hours prior to the flight's scheduled departure time.
Southwest Airlines offers passengers the option to purchase tickets online. When you reserve a flight online the airline sends you an email that includes a six-digit, alphanumeric reservation-confirmation-number; this eliminates the need for a paper ticket. The confirmation number allows you to check-in for your flight -- online -- up to 24 hours prior to your scheduled departure time. You have the option of using your ticketless confirmation to check in at a Southwest Airline kiosk at the airport.