Romanian aerospace company Aerostar S.A., was among the first independent European MRO providers to install Split Scimitar Winglets (SSW) onto two Boeing 737-800s of TUIFly Nordic. Aerostar is currently carrying out the same work on a Boeing 737-800 (msn 37238; registration OO-JAX) for TUI Airlines Belgium trading as Jetairfly, at its Bacau facility in north-east Romania. It is a heavy check together with SSW retrofit. The lead-time for the SSW, wing reinforcement and winglet installation, is seven days, absorbed in the turn-around time for the maintenance check. After OO-JAX is completed, a similar work programme will be carried out on the next aircraft OO-JAU (msn 37250), also from JetAirfly.