content_image/581133.jpg content_image/581131.jpg content_image/581129.jpg content_image/581130.jpg
<img src='content_image/581133.jpg'>

operating in the low altitude structure as follows: 

<img src='content_image/581131.jpg'>

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: 

<img src='content_image/581129.jpg'>

<img src='content_image/581130.jpg'>

## Operations in Other Countries 

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 

