Figure 2-67. Altimeter setting changes.  operating in the low altitude structure as follows:  When flight crews transition from the U.S. NAS to another  country’s airspace, they should be aware of differences not  only in procedures but also airspace. For example, when  flying into Canada as depicted in Figure 2-67, notice the  change from transition level (QNE) to transition altitude  (QNH) when flying north-bound into the Moncton flight  information region (FIR).  Operations in international airspace demand that pilots  are aware of, and understand the use of, the three types  of altimeter settings. Most overseas airports give altimeter  When the minimum altitude, as prescribed in 14 CFR Part  91, § 91.159 and 91.177, is above 18,000 feet MSL, the  lowest usable flight level is the flight level equivalent of  the minimum altitude plus the number of feet specified  according to the lowest flight level correction factor as  follows:  2-44  Altimeter Setting  Correction Factor  29.92 or higher  —  29.91 to 29.42 500 feet  Altimeter Setting  Correction Factor  29.41 to 28.92  1,000 feet  28.91 to 28.42  1,500 feet  28.41 to 27.91  2,000 feet  27.91 to 27.42  2,500 feet  Current Altimeter Setting  Lowest Usable Flight Level  29.92 or higher  180  29.91 to 29.42  185  29.41 to 28.92  190  28.91 to 28.42  195  28.41 to 27.91  200  Operations in Other Countries  F$_{AA AIR SERVICE OUTSIDE U}$$_{.S. AIRSP}$ ACE IS PRO$_{VIDED IN ACCORD}$$_{ANCE WITH}$ ARTICLE 12 AND ANNEX 11 OF ICAO CONVENTION. ICAO CONVENTION NOT $^{APPLICABLE TO ST}$A$_{TE AIRCRAF}$$_{T BUT}$ $^{COMPLIANCE WITH ICAO ST}$AND ARDS $^{AND PRACTICES IS ENCOURAGED}$.  NOT FOR NAVIGATION MONCTON FIR CZQM  AL TIMETER QNH  QNE  CRABB N42° 13.00´ W65° 44.00´ 