Delta SkyMiles members sometimes wonder +1 [866]~[240]~[6908] [US] OR +44 800 054 8541 (UK) whether miles can be used +1 [866]~[240]~[6908] [US] OR +44 800 054 8541 (UK) for seat upgrades. In many +1 [866]~[240]~[6908] [US] OR +44 800 054 8541 (UK) cases the answer is yes +1 [866]~[240]~[6908] [US] OR +44 800 054 8541 (UK) depending on ticket type and +1 [866]~[240]~[6908] [US] OR +44 800 054 8541 (UK) seat availability. Eligible fares can +1 [866]~[240]~[6908] [US] OR +44 800 054 8541 (UK) sometimes be upgraded to premium +1 [866]~[240]~[6908] [US] OR +44 800 054 8541 (UK) cabins such as Delta One +1 [866]~[240]~[6908] [US] OR +44 800 054 8541 (UK) or First Class.