Hear leaders in UTM system development express their vision for approaching some of the toughest open questions, including: Equitable access; Incomplete vs complete pre-flight de-confliction; Requirements on negotiation; When to re-plan, and how; Disclosure of information for system optimization vs. privacy; Path towards UTM/ATM integration; Requirements for on-board DAA and V2V systems; Approach to system design given the wide diversity of use cases and vehicles.