What is the name of Southwest Airlines' mobile app?

The correct choice is the Southwest Airlines Mobile App. This is the official name of the application designed for mobile devices that allows customers to manage their travel plans, including booking flights, checking in, and accessing boarding passes. The name reflects the airline's brand identity clearly and is easily recognizable for users seeking resources related to their travel with Southwest Airlines.

The other options do not accurately capture the official name of the app used by Southwest Airlines, which can lead to confusion for customers looking for the right application to download or use for their travel needs. Having the full name underscores Southwest’s commitment to providing a user-friendly and cohesive brand experience across their digital platforms.