Femtosecond lasers are now a key technology for high precision manufacturing. They offer high quality, small feature size, and can process virtually any material. However, due to the relatively small amount of ablated matter per pulse, they have so far been limited to small parts processing. The growing availability of high average power femtosecond lasers, now reaching the kiloWatt level, enables to bring the benefits of femtosecond laser micro-processing to the macro-scale. An attractive application is large area surface functionalisation. We report on new developments aimed at improving plane wings aerodynamics by femtosecond laser micro-texturing. The creation or riblets, which are grooves engraved in the direction of air flow, can lead to a reduction of up to 9% in fuel consumption and contaminants emission. Riblets have a small feature size: The pitch and height of the groove is typically on the order of a few tens of micrometers. Achieving the required precisionand processing speedover large surfaces is challenging. We report on a combination of high average power femtosecond laser and beam shaping, to enable beam splitting and square top-hat generation. We present texturing tests that demonstrate the feasibility of the propose technique. We show that changing the beam profile from circular gaussian to square top-hat significantly improves the process speed. The combination of high power laser and advanced beam shaping has the potential to enable the production of high quality surface structures for new aerospace applications.