Methods and systems for a transportation vehicle are provided. For example, one method includes storing or installing a security certificate in a portable device associated with an aircraft, the security certificate defining a duration for using the portable device for remotely accessing an aircraft computing system; obtaining the security certificate from the portable device, after validating a request from a user console; and providing the security certificate to the user console to access the aircraft computing system via the portable device for no longer than the duration defined by the security certificate.