Citigroup escalates credit-card wars with boost to top card's dining, air travel rewards

Banks have been fighting to entice big spenders to use their cards for years. That battle escalated in 2016 when J.P. Morgan introduced its Sapphire Reserve card, which came with lavish perks and was so popular the bank initially ran out of the metal used for the cards. Now, Citigroup is joining the fray with a card that more heavily incentivizes users to funnel all of their dining and air travel purchases through it.