The International Civil Aviation Organization’s symposium on performance-based navigation (PBN) runs from October 16 to October 19 at ICAO headquarters in Montreal. The event will include speakers and attendees from every PBN stakeholder group, including pilots, air traffic controllers, airlines, system manufacturers, regulators and air navigation service providers. The preliminary agenda calls for talks such as, PBN and the Global Air Navigation Plan, the business case for PBN, implementation challenges, airspace and procedural design, environmental impact and more.