ENR 2. Air Traffic Services Airspace

1. ENR 2.1 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.