I don't carry United explorer, but I have Barclays arrival, Amex Prem Gold, Ink bold, Chase
Sapphire Pref.
Before you do all that, downgrade your current
Sapphire Pref card to Freedom.
Suprised it's not mentioned here, but from what I was told by CSR, it is not allowed to convert an existing Chase branded product incl
Sapphire Pref to Freedom unless over 1 year has passed since applying.
Not exact matches
Funny musings @ Amex... Got the
Sapphire Reserve some time ago, have all other Chase Cards, plus the new Ink Biz
Pref.