81 FAA Chart Users’ Guide - IFR Enroute Symbology Enroute Chart Examples Airspace Information (Continued) 2 3 1 1 2 Directional Jet Route with Time Restrictions High RNAV Route with MEA for DME/DME/IRU RNAV  Aircraft Description Reference Number MEA of 24,000’ Jet Route 34 available between 1100 - 0300Z High Enroute Chart