Methods and apparatus for a smartcard system are provided which securely and conveniently integrate important travel-related applications. In one embodiment, a smartcard system includes a cardholder identification application and various additional applications useful in particular travel contexts; for example, airline, hotel, rental car, and payment-related applications. Furthermore, memory space and security features within specific applications provide partnering organizations (e.g., airlines, hotel chains, and rental car agencies) the ability to construct custom and secure file structures.