ENR 2.1 FIR, UIR, TMA and CTA

1.. FIR, UIR, TMA and CTA

1. US charting data is available for Flight Information Regions (FIRs), Upper Flight Information Regions ­(UIRs), Terminal Control Areas (TMAs) and Control Areas (CTAs) at 28 Day National Airspace System ­Resources (NASR) Subscription. Data is updated every 28 days.