Contact Delta right away if you miss your flight. Based on your fare type and reason (e.g., airline delay vs. personal issue), rebooking onto the next flight may be available, albeit sometimes at an additional charge. There may also be same-day change or standby provisions. Failure to rebook may cause the ticket to depreciate in value. Ensure you verify Delta policies, as each class h... https://www.adventuresfare.com/blog/what-happens-if-i-miss-my-flight-on-delta/