The Port Authority board on Thursday unanimously approved plans to hike AirTrain fares, increase bridge and tunnel tolls and to slap a surcharge on cab trips to and from area airports.

“To achieve 21st century transportation facilities, which is what this region deserves, requires funding,” executive director Rich Cotton said, citing the authority’s “largest ever” $37 billion capital plan.

“We must reverse decades of under-investment, and our funding sources must keep up with inflation,” he added.

In response to hundreds of public comments, the Port Authority opted to reduce the proposed app-based for-hire vehicle fee from $4 to $2.50 and the fee on taxi pick-ups from $4 to $1.25.

Officials also nixed plans to require frequent Bayonne Bridge drivers to traverse the crossing 10 times — as opposed to three — before receiving a discount.

Otherwise, the fare and toll changes proposed earlier this summer will move forward.

Starting Jan. 5, drivers will pay an extra $1 to cross the Port Authority’s bridges and tunnels, on top of the current $15 cash toll. E-ZPass holders will pay $13.75 during peak hours and $11.75 during off-peak hours, up $1.25 from the current fee. An existing discount on carpool users will also be eliminated.

Meanwhile, AirTrain fares will jump from $5 to $7.75 on Nov. 1.

The for-hire vehicle fees will go into effect on Oct. 3, 2020. Pooled app-based trips will only be charged $1.25, as will taxi pick-ups through 2022 — when the fee will jump $0.50 cents. Taxi drop-offs are exempt from the new fees.

Taxi driver advocates lauded the agency’s decision to reduce the new fees, which came with a commitment from the agency to improve driver facilities at Newark, LaGuardia and Kennedy airports and crack down on attempts by off-the-books “hustlers” to pluck fares from registered drivers.

“I’ve been driving for 30 years at the airport, and we feel like we’ve been abandoned. The conditions are deplorable. The waiting time getting to LaGuardia’s bathrooms, everything,” New York Taxi Workers Alliance member Victor Salazar told board members.

On top of the fees, the Port Authority board also approved $5 billion in additional spending for the 10-year capital plan, which was previously valued at $32 billion.

The amended plan includes another $350 million for the controversial LaGuardia Airport AirTrain, whose price has exploded from an estimate of $450 million in 2015 to $2 billion, despite concerns travelers won’t actually use it.