American Airlines concluded a difficult 2020 with another quarterly loss due to the coronavirus hit but said Thursday it expects a rebound to begin later in 2021. The big US carrier reported a fourth quarter loss of $2.2 billion, compared with profits of $414 million in the year-ago period. For all of 2020, American lost $8.9 billion after reporting profits of $1.7 billion in 2019. jmb/dw