The South Florida Tri-Rail is also another means of transportation to/from FLL including to/from MIA. They offer an employee discount program which offers a 15% discount on monthly as 12-trip passes. It also offers commuter tax benefits, free parking at all Tri-Rail stations and easy transfers to the Tri-County bus Service.
From the website https://www.tri-rail.com, click on FARES and then locate the Employer Discount Program and click on Employees. Start the EDP Application by filling in all the boxes. It will ask for Employer information; select Frontier Airlines. Submit the application and await your EDP Easy Card.