Some United cardholders have now received targeted card upgrade offers. After upgrading, you can earn 15,000 miles with just one purchase. You can check the links below to see whether you were targeted. As far as I can remember, Chase has not sent out similar upgrade offers before. If a United card fits your needs, it can also be worth keeping long term. After all, 15,000 United miles are still worth a bit more than the Explorer card’s $150 annual fee, and in the worst case you can always downgrade again after a year.
