Delta Airlines, established in 1925 and a member of the SkyTeam Alliance, offers a risk-free cancellation policy allowing passengers 24 hours to cancel qualifying e-tickets for a full refund. After the 24-hour period, cancellation fees apply depending on ticket type and itinerary, with refunds available as e-credits for non-refundable tickets. For refunds, purchases made by credit card typically process within seven business days, while cash or check refunds may take up to 20 business days.