# How does ICAO differentiate between Commercial and Private flights?

How is the difference between Commercial and Private/General Aviation flights defined by ICAO?

Here in the US, we use 91 flights -vs- 135 flights, but from what I've heard they use a different definition, particularly concerning business aviation flights that fall under Part 91.

In other words, what determines whether ICAO Annex 6 Part 1 or Part 2 applies to a particular flight?

According to ICAO Annex 6 Part 1 (PDF):

The Standards and Recommended Practices contained in Annex 6, Part I, shall be applicable to the operation of aeroplanes by operators authorized to conduct international commercial air transport operations.

According to ICAO Annex 6 Part 2 (PDF):

International general aviation operations with:

a) aeroplanes with a maximum certificated take-off mass exceeding 5,700 kg; or

b) aeroplanes equipped with one or more turbojets engines.

The International Flight Plan form also requires flight type to be declared, but I am not sure that this would be ICAO's sole requirement.

Type of flight—Indicate which one:

S—Scheduled air transport
N—Non-scheduled air transport
G—General aviation
M—Military
X—Other


For a simpler explanation, this PDF lists civil aviation activities: