Several international and Brazilian firms have helped airlines Azul and GOL sign a memorandum of understanding (MoU) to merge their operations, but market dominance concerns have triggered a rigorous review by the country’s antitrust watchdog. GOL’s parent company Abra Group has instructed Brazilian firm Pinheiro Guimarães and US firm Wachtell, Lipton, Rosen & Katz LLP to steer the merger, while two Cescon, Barrieu, Flesch & Barreto Advogados offices assisted Azul. Sócios Cristina Cescon e Darkson Galvão em São Paulo e sócio Fernanda Montorfano e associados Victor Campinho e Caroline Matos no Rio de Janeiro.