const flightRulesMap = <String, List<double>>{ 'VLIFR': [60.0, 800.0], 'LIFR': [150.0, 1600.0], 'IFR': [300.0, 5000.0], 'MVFR': [900.0, 8000.0], 'VFR': [40000.0, 20000.0], };