There are more reasons, including the opportunity to sit in a comfortable cabin with large seats that you may convert into beds. As per the Delta Airlines upgrade business/first class rules, you may upgrade your seat before your scheduled departure, but it will be subject to terms and conditions. After the seat upgrade, you will also receive additional benefits such as deciduous meals, free access to beautiful lounges, and priority for boarding.
https://flightcancellationpoli....cy.com/delta-airline
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