It's about time! They hid it then broke it, what, a decade ago? Back in the early days I could get online one night on a whim & fill an empty seat the next day

It's about time! They hid it then broke it, what, a decade ago? Back in the early days I could get online one night on a whim & fill an empty seat the next day for mutual benefit to me & the carrier... I presume, unsure how $150 + 200 lbs over 2000 miles in the air compares to flying with an empty seat. Last time I looked, ~2008, no matter how many options I checked or unchecked their counter-offer was never below the static prices of standard, < 30 days advance booking prices.