The company, which currently operates two amphibious Cessna Caravans and a de Havilland DHC-2 Beaver, will add a second Beaver under the ownership of hotelier Dr Jerry Schwartz, with a fifth seaplane expected by the end of the year.
The service, to be operated with 100-seat Embraer E190 aircraft, will fly three times per week return between the two destinations starting 14 April, and is estimated to add around 30,000 seats per year on the route.
The National Transportation Safety Board (NTSB) has recovered black boxes from both the American Airlines Bombardier CRJ700 passenger jet and the US Army Sikorsky UH-60 Black Hawk helicopter involved in the incident, which killed all 67 people on board both aircraft.
The union said the fresh deal would see pay rises of up to 12 per cent over two years alongside improvements to rostering and rest periods.
The new LAX service will operate three times weekly from December using the carrier’s fleet of 275-seat A350-900 aircraft.
The jet was carrying 64 people when the incident occurred at Ronald Reagan National Airport near Washington on Thursday, sparking a huge search and rescue operation.