Delta Air Lines will install Vortex Control Technologies Finlet modification packages on 240 Boeing 737-800 and 737-900ER aircraft, extending an aerodynamic retrofit across its 737NG narrowbody fleet.
The rollout follows technical evaluation, flight-test data, operational trend analysis and engineering review. VCT says the finlets reduce flow separation and improve aft-fuselage pressure distribution, cutting drag and fuel burn. Delta is using the retrofit to tighten fleet efficiency without waiting for new airframes or propulsion changes.
For operators, the signal is clear: incremental aerodynamics still has room to move the fuel needle.