or following the identifier, the routing is understood to be  direct to or from that point unless otherwise cleared by ATC.  Routes beginning and ending with an airway indicate that  the airway essentially overflies the airport, or radar vectors  are issued. [Figure 2-21] Where more than one route is listed  to the same destination, ensure that the correct route for  the type of aircraft classification has been filed. These are  denoted after the route in the altitude column using J (jet  powered), M (turbo props/special, cruise speed 190 knots  or greater), P (non-jet, cruise speed 190 knots or greater),  or Q (non-jet, cruise speed 189 knots or less). [Figure 2-22]  Although all airports are not listed under the destination  column, IFR flights may be planned to satellite airports in  the proximity of major airports via the same routing. When  filing flight plans, the coded route identifier (i.e., BURL 1,  VTUL4, or POML3) may be used in lieu of the route of flight.  the route, and the fourth shows the destination airport,  which are also listed alphabetically. When flight planning,  it is important to always check current publications for  information about the departure and destination airport.  Routes are effective only during each respective terminal  facilities normal operating hours. Always check NOTAMs  to ensure that appropriate terminal facilities are operating  for the planned flight time. Altitudes are always listed in  thousands of feet. ATC may request that the pilot changes  altitude while in flight in order to maintain the flight within  approach control airspace. ATC provides radar monitoring  and, if necessary, course guidance if the highest altitude  assigned is below the MEA.  Shown in Figure 2-21, under the second column, the word  “Direct” appears as the route when radar vectors are used  or no airway exists. This also indicates that a SID or STAR  may be assigned by ATC. When a NAVAID or intersection  identifier appears with no airway immediately preceding  2-11  Figure 2-19. Tower En Route Control (TEC) Northeast U.S. (Eastern).  TOWER EN ROUTE CONTROL (TEC)  Northeast U.S. (Eastern)  (Lines connecting airports  depict adjacent approach  control facilities)  CLE  Radar approach control area  PIT  CKB  ROA  RIC  IAD  HAR  RDG  ABE  NYC  ACY  WRI PHL  BWI  DOV  AVP  BGM  ELM  DCA  PXT  ORF  CRW  GSO  ERI  BUF  YNG  CAK  HTS  DC  PENNSYLVANIA  WEST VIRGINIA  VIRGINIA  MARYLAND  NEW JERSEY  DELAWARE  LEGEND 