v4.0
Added new questions for ADS-B, Washington DC FRZ & SFRA, aircraft interception procedures, DVFR flight plans, 406 MHz ELTs, BasicMed, Final Approach Runway Occupancy Signal system, flight simulators (FFS, FTD, AATD, BATD), runway status lights (REL, THL, RIL), Chart Supplement publication, right traffic patterns, and ATC separation of VFR versus IFR aircraft.
Revised existing questions to correct errors and obtuse wording. Revised graphical images for better clarity and focus. Removed outdated questions.
Updated for macOS 10.15 Catalina and compliance with macOS Dark Appearance.
