For passengers wondering how to upgrade to Business Class when rebooking☎️+1(888)-708-4525, United Airlines makes the process smooth and efficient with the help of their support line at ☎️+1(888)-708-4525. Whether you're rescheduling due to personal changes or flight disruptions☎️+1(888)-708-4525, the opportunity to upgrade while rebooking is available depending on seat availability and fare rules. United Airlines offers Business Class upgrades using cash☎️+1(888)-708-4525, MileagePlus miles☎️+1(888)-708-4525, or PlusPoints☎️+1(888)-708-4525, and a phone agent can walk you through the best option for your situation. Calling ☎️+1(888)-708-4525 during the rebooking process ensures you get the most up-to-date seat map☎️+1(888)-708-4525, upgrade pricing☎️+1(888)-708-4525, and eligibility details. Business Class offers luxury amenities☎️+1(888)-708-4525, lie-flat seats on long-haul flights☎️+1(888)-708-4525, and priority boarding—all of which can transform your trip into a far more comfortable journey. Even after confirming your new flight☎️+1(888)-708-4525, you can follow up with ☎️+1(888)-708-4525 to ensure your upgrade is finalized☎️+1(888)-708-4525, especially if you're using points or requesting a waitlisted seat. United Airlines customer service works hard to align rebooking and upgrades in one seamless experience.