A major low-cost carrier’s bid for 25% of Argentina’s domestic aviation market in 2026 will intensify legal and regulatory activity around fleet expansion and competitive access. With deregulation enabling aircraft interchange and streamlined certifications, the airline is rapidly scaling its operations - adding fuel-efficient aircraft and launching new routes to underserved destinations. Legal teams advising carriers, airports, and investors must prepare for increased demand in aircraft leasing, slot negotiations, and environmental compliance. The new aircraft model’s sustainability features also bring environmental, social and governance considerations into sharper legal focus. Argentina’s liberalised aviation landscape now provides the perfect opportunity for low-cost growth and legal strategy will be key to navigating it.