Luxury credit card rivalry heats up as Amex, JPMorgan tease updates to their premier cards

The long-running rivalry between the country's top premium credit cards is about to heat up again.JPMorgan Chase announced last week that a refresh of its Sapphire Reserve — the travel and dining rewards card that went viral when it arrived in 2016 — was imminent.In response, American Express on Monday said that "major" changes were coming to its consumer and business Platinum cards later this year. While short on details, the New York-based card company said that its update would be its largest ever invest ...