Shares of American Airlines Group Inc. AAL, +1.64% shot up 4.6% in premarket trading Tuesday, after the air carrier joined a number of its peers in raising its first-quarter revenue outlook, but said that would be "more than offset" by rising fuel and other expenses. The company now expects revenue to be down 17% from the same period in 2019, compared with previous guidance of down 20% to 22%, while cutting its capacity estimate to down 10% to 12% from down 8% to 10%.