Visit the Delta website to enroll in the Sky Miles frequent flyer program.
Enter your first and last name and your date of birth. Provide your contact information, including your email address, phone number and mailing address.
Create a four-digit PIN, which you can make with any four numbers of your choice.
Review the information you provided to ensure you didn't make any mistakes. Before submitting your enrollment information, determine whether you want to apply for the Delta Sky Miles credit card from American Express. If so, you'll need to click the box next to the offer. If not, ignore the box.
Click "Continue." Keep your confirmation page for your records, as it contains your Delta Sky Miles member number.