The advertised price is not an offer and is subject to change. When you click Complete Purchase, you agree to accept all Fare Rulesopens in a new window for each flight, and all terms in Delta's applicable Contract of Carriageopens in a new window. No contract exists until you receive confirmation that payment was received and processed, and you have received a ticket number for each confirmed passenger. Upgrades may only be purchased for Delta- or Delta Connections- operated flights, must be more than 24 hours prior to departure of the initial segment of the itinerary, and are not available for Award Tickets and certain discounted and exception fares. Additional eligibility restrictions may apply in Delta's sole discretion. All passengers and segments must be upgraded to First/Business class within the confirmation number, except in instances where the aircraft has only a Main Cabin. Since the original ticket is being reissued , the prior ticket number is no longer valid and will be superseded by your new ticket number. Rules of your initial reservation will apply regardless of whether rules that would otherwise apply to the fare class of your upgraded ticket are less restrictive, i.e. changeability/refundabilityopens in a new window Upgraded tickets are eligible for additional mileage, MQM, and MQD accruals due to the selection of First/Business class cabin and associated fare class and the increase in base fare or carrier imposed surcharges paid in connection with your upgrade. All SkyMiles program rules apply to SkyMiles program membership, miles, offers, mile accrual, mile redemption and travel benefits, respectively. To review the rules, please visit Membership Guide & Program Rules.opens in a new window If you purchased trip insurance when purchasing your Main Cabin ticket, your benefits under the trip insurance policy are limited to those applicable under your Main Cabin ticket. Prices, offers, rules, and benefits are subject to change. We reserve the right to assign or reassign your upgraded seat at any time, even after boarding of the aircraft, for operational, safety or security reasons. The final decision resides with the ground staff and the operating crew on the day of the flight. Refunds will be issued to any reassigned customer if the customer is not moved to a comparable or better seat. No refund will be provided for any previously purchased ancillary product such as Priority Boarding or Delta Comfort+ ™ seating.