Not for C+ but you could request upgrades for F.
- If you and one companion are in the same reservation, upgrades to domestic Delta One, First Class and Delta Comfort+ work the same way: your upgrades, if available, will clear based on the Status of the higher-tiered Member. This applies to companions who are Medallion Members themselves as well as General Members who do not have Medallion Status and partner airline elite members. For example, if a Diamond Medallion Member and General Member are traveling together, both upgrades will clear at the Diamond window, if available.
- If you and your companion are in different reservations, upgrades to First Class and Delta Comfort+ work a little differently:
- For domestic Delta One and First Class, your upgrades will clear based on your individual Member Status and confirmation windows, if available. For example, if Platinum and Silver Medallion Members are traveling together, the Platinum Medallion Member will clear at the Platinum window and the Silver Medallion Member will clear at the Silver window. If your companion is a General Member who does not have Medallion Status, their upgrade will clear no sooner than 24 hours prior to departure.
- For Delta Comfort+, General SkyMiles Members are not eligible for Complimentary Upgrades. The Medallion Member will clear for their upgrade at their respective window.
https://www.delta.com/content/www/en...html#companion