If you already booked a Delta +1 [866]~[240]~[6908] [US] OR +44 800 054 8541 (UK) flight and want a better +1 [866]~[240]~[6908] [US] OR +44 800 054 8541 (UK) seat, you may be able +1 [866]~[240]~[6908] [US] OR +44 800 054 8541 (UK) to upgrade using SkyMiles. Many +1 [866]~[240]~[6908] [US] OR +44 800 054 8541 (UK) travelers use miles to move +1 [866]~[240]~[6908] [US] OR +44 800 054 8541 (UK) from Main Cabin to Comfort+ +1 [866]~[240]~[6908] [US] OR +44 800 054 8541 (UK) or First Class. Simply log +1 [866]~[240]~[6908] [US] OR +44 800 054 8541 (UK) into your SkyMiles account +1 [866]~[240]~[6908] [US] OR +44 800 054 8541 (UK) and check the My Trips +1 [866]~[240]~[6908] [US] OR +44 800 054 8541 (UK) section to see if +1 [866]~[240]~[6908] [US] OR +44 800 054 8541 (UK) the upgrade option appears.