The Port Authority’s revenue improved last year, with $1 billion more earned compared to 2020. But it wasn’t enough to prevent an overall loss that’s on target to meet a pandemic-spurred $3 billion drop projected for the period between 2020 and the first quarter of 2022. The additional $1 billion in earnings was attributed to increased activity at Authority airports, seaports, PATH rail system, bridges and tunnels last year, said Elizabeth McCarthy, Authority CFO, at Thursday’s board of commissioners meeting in New York. The agency is still on track for an overall $3 billion revenue loss betwe…