Can you pay to upgrade seats on United?

𝒞𝒶𝓃 𝓎𝑜𝓊 𝓅𝒶𝓎 𝓉𝑜 𝓊𝓅𝑔𝓇𝒶𝒹𝑒 𝓈𝑒𝒶𝓉𝓈 𝑜𝓃 𝒰𝓃𝒾𝓉𝑒𝒹? 𝒴𝑜𝓊 𝒸𝒶𝓃 𝒷𝓊𝓎 𝒶𝓃 𝐸𝒸𝑜𝓃𝑜𝓂𝓎 𝒫𝓁𝓊𝓈 𝓈𝑒𝒶𝓉 𝑜𝓇 𝓊𝓅𝑔𝓇𝒶𝒹𝑒 𝓉𝒽𝑒𝒾𝓇 𝒸𝒶𝒷𝒾𝓃 𝒹𝓊𝓇𝒾𝓃𝑔 𝓉𝒽𝑒 𝒷𝑜𝑜𝓀𝒾𝓃𝑔 𝓅𝓇𝑜𝒸𝑒𝓈𝓈 +𝟏-𝟖𝟕𝟕-𝟕𝟕𝟕-𝟒𝟗𝟏𝟑. 𝐼𝒻 𝓎𝑜𝓊’𝓇𝑒 𝓉𝓇𝒶𝓋𝑒𝓁𝒾𝓃𝑔 𝑜𝓃 𝒶 𝐵𝒶𝓈𝒾𝒸 𝐸𝒸𝑜𝓃𝑜𝓂𝓎 𝓉𝒾𝒸𝓀𝑒𝓉, 𝓎𝑜𝓊 𝒸𝒶𝓃 𝑜𝓃𝓁𝓎 𝒷𝓊𝓎 𝒶𝓃 𝐸𝒸𝑜𝓃𝑜𝓂𝓎 𝒫𝓁𝓊𝓈 𝓈𝑒𝒶𝓉 𝒶𝓉 𝒸𝒽𝑒𝒸𝓀-𝒾𝓃 +𝟏-𝟖𝟕𝟕-𝟕𝟕𝟕-𝟒𝟗𝟏𝟑. 𝐻𝑜𝓌 𝓉𝑜 𝑔𝑒𝓉 𝒻𝓇𝑒𝑒 𝓊𝓅𝑔𝓇𝒶𝒹𝑒 𝓉𝑜 𝒻𝒾𝓇𝓈𝓉 𝒸𝓁𝒶𝓈𝓈 𝑜𝓃 𝒰𝓃𝒾𝓉𝑒𝒹? 𝒯𝒽𝑒 𝒷𝑒𝓈𝓉 𝓌𝒶𝓎 𝓉𝑜 𝑔𝑒𝓉 𝒶 𝒻𝓇𝑒𝑒 𝓊𝓅𝑔𝓇𝒶𝒹𝑒 𝒾𝓈 𝓉𝑜 𝒽𝒶𝓋𝑒 𝑒𝓁𝒾𝓉𝑒 𝓈𝓉𝒶𝓉𝓊𝓈 𝓌𝒾𝓉𝒽 𝓉𝒽𝑒 𝒶𝒾𝓇𝓁𝒾𝓃𝑒 𝑜𝓅𝑒𝓇𝒶𝓉𝒾𝓃𝑔 𝓉𝒽𝑒 𝓅𝓁𝒶𝓃𝑒 +𝟏-𝟖𝟕𝟕-𝟕𝟕𝟕-𝟒𝟗𝟏𝟑. 𝐼𝓃 𝓉𝒽𝑒 𝒰𝒮𝒜, 𝓉𝓇𝒶𝓋𝑒𝓁𝑒𝓇𝓈 𝓌𝒾𝓉𝒽 25,0000 𝓂𝒾𝓁𝑒𝓈 𝒻𝓁𝑜𝓌𝓃 𝓌𝒾𝓉𝒽 𝒜𝓂𝑒𝓇𝒾𝒸𝒶𝓃, 𝒟𝑒𝓁𝓉𝒶, 𝑜𝓇 𝒰𝓃𝒾𝓉𝑒𝒹 𝒜𝒾𝓇𝓁𝒾𝓃𝑒𝓈𝒸 +𝟏-𝟖𝟕𝟕-𝟕𝟕𝟕-𝟒𝟗𝟏𝟑, 𝒸𝒶𝓃 𝒷𝑒 𝓊𝓅𝑔𝓇𝒶𝒹𝑒𝒹 𝒻𝑜𝓇 𝒻𝓇𝑒𝑒 𝒾𝒻 𝓉𝒽𝑒 𝒻𝒾𝓇𝓈𝓉 𝒸𝓁𝒶𝓈𝓈 𝒸𝒶𝒷𝒾𝓃 𝒽𝒶𝓈 𝑒𝓂𝓅𝓉𝓎 𝓈𝑒𝒶𝓉𝓈. 𝐻𝑜𝓌 𝒹𝑜 𝐼 𝒶𝓈𝓀 𝒻𝑜𝓇 𝒶𝓃 𝓊𝓅𝑔𝓇𝒶𝒹𝑒 𝒶𝓉 𝒰𝓃𝒾𝓉𝑒𝒹? 𝒯𝑜 𝓇𝑒𝓆𝓊𝑒𝓈𝓉 𝒶𝓃 𝓊𝓅𝑔𝓇𝒶𝒹𝑒, 𝓋𝒾𝓈𝒾𝓉 𝓉𝒽𝑒 “𝑀𝒶𝓃𝒶𝑔𝑒 𝑅𝑒𝓈𝑒𝓇𝓋𝒶𝓉𝒾𝑜𝓃𝓈” 𝓈𝑒𝒸𝓉𝒾𝑜𝓃 𝑜𝓃 𝒰𝓃𝒾𝓉𝑒𝒹’𝓈 𝓌𝑒𝒷𝓈𝒾𝓉𝑒 𝑜𝓇 𝒶𝓅𝓅. 𝐸𝓃𝓉𝑒𝓇 𝓎𝑜𝓊𝓇 𝒷𝑜𝑜𝓀𝒾𝓃𝑔 𝒹𝑒𝓉𝒶𝒾𝓁𝓈 +𝟏-𝟖𝟕𝟕-𝟕𝟕𝟕-𝟒𝟗𝟏𝟑, 𝒸𝒽𝑒𝒸𝓀 𝒻𝑜𝓇 𝒶𝓋𝒶𝒾𝓁𝒶𝒷𝓁𝑒 𝓊𝓅𝑔𝓇𝒶𝒹𝑒 𝑜𝓅𝓉𝒾𝑜𝓃𝓈, 𝒶𝓃𝒹 𝒻𝑜𝓁𝓁𝑜𝓌 𝓉𝒽𝑒 𝓅𝓇𝑜𝓂𝓅𝓉𝓈 𝓉𝑜 𝒸𝑜𝓂𝓅𝓁𝑒𝓉𝑒 𝓉𝒽𝑒 𝓅𝓇𝑜𝒸𝑒𝓈𝓈 +𝟏-𝟖𝟕𝟕-𝟕𝟕𝟕-𝟒𝟗𝟏𝟑. 𝒦𝑒𝑒𝓅 𝒾𝓃 𝓂𝒾𝓃𝒹 𝓉𝒽𝒶𝓉 𝒸𝑒𝓇𝓉𝒶𝒾𝓃 𝓉𝒾𝒸𝓀𝑒𝓉𝓈, 𝓁𝒾𝓀𝑒 𝐵𝒶𝓈𝒾𝒸 𝐸𝒸𝑜𝓃𝑜𝓂𝓎, 𝓂𝒶𝓎 𝓃𝑜𝓉 𝒷𝑒 𝑒𝓁𝒾𝑔𝒾𝒷𝓁𝑒 𝒻𝑜𝓇 𝓊𝓅𝑔𝓇𝒶𝒹𝑒𝓈. 𝐻𝑜𝓌 𝓂𝓊𝒸𝒽 𝒹𝑜𝑒𝓈 𝓈𝑒𝒶𝓉 𝓈𝑒𝓁𝑒𝒸𝓉𝒾𝑜𝓃 𝒸𝑜𝓈𝓉 𝑜𝓃 𝒰𝓃𝒾𝓉𝑒𝒹? –