What are email & SMS flight status alerts?

This complimentary service allows you to receive flight status updates by email or by SMS. You can choose to be alerted if there are any departure and/or arrival delays for specific flights and dates relevant to you. You can also opt in to receive the actual departures and arrival times of any flights.

Related questions

When will I receive alert messages, and how many?
What information will a flight status alert contain?
How do I register to receive alerts?