Chapter 2: Airspace Classification, Operating Requirements, and Flight Restrictions An advisory service provided by Flight Service facilities, which are located on the landing airport,  using a discrete ground-to-air frequency or the tower frequency when the tower is closed. LAA  services include local airport advisories, automated weather reporting with voice broadcasting, and  a continuous Automated Surface Observing System (ASOS)/Automated Weather Observing Station  (AWOS) data display, other continuous direct reading instruments, or manual observations available  to the specialist. MTRs are routes used by military aircraft to maintain proficiency in tactical flying. These routes are  usually established below 10,000 feet MSL for operations at speeds in excess of 250 knots. Some  route segments may be defined at higher altitudes for purposes of route continuity. Routes are  identified as IFR (IR), and VFR (VR), followed by a number.  [Figure 2-7]  MTRs with no segment above  1,500 feet AGL are identified by four number characters (e.g., IR1206, VR1207). MTRs that include  one or more segments above 1,500 feet AGL are identified by three number characters (e.g., IR206,  VR207). IFR low altitude en route charts depict all IR routes and all VR routes that accommodate  operations above 1,500 feet AGL. IR routes are conducted in accordance with IFR regardless of  weather conditions. VFR sectional charts depict military training activities, such as IR, VR, MOA,  restricted area, warning area, and alert area information. A flight data center (FDC) Notice to Airmen (NOTAM) is issued to designate a TFR. The NOTAM  begins with the phrase “FLIGHT RESTRICTIONS” followed by the location of the temporary  restriction, effective time period, area defined in statute miles, and altitudes affected. The NOTAM  Remote Pilot – Small Unmanned Aircraft Systems Study Guide  10  Temporary Flight Restrictions (TFR) Military Training Routes (MTRs) Local Airport Advisory (LAA) • Wildlife Areas/Wilderness Areas/National Parks and request to operate above 2,000 AGL • National Oceanic and Atmospheric Administration (NOAA) Marine Areas off the coast with  requirement to operate above 2,000 AGL • Tethered Balloons for observation and weather recordings that extend on cables up to 60,000 Figure 2-7.  Military training route (MTR) chart symbols.