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. Online check-in & baggage payment Check-in Online: Within 24 hrs of scheduled departure flight; then simply drop off bags at Baggage Drop or curbside check-in station within 6 hrs of departure. Higher fees apply for Airport check-in.