It should be noted that the command "airport" is not a default command and requires a sudo and password authentication to enable. Use the following, assuming you understand that a sudo call should not be taken lightly:

sudo ln -s /System/Library/PrivateFrameworks/Apple80211.framework/Versions/Current/Resources/airport /usr/sbin/airport

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No, there's no need for sudo to enable the airport program used here, only to create the symbolic link you mentioned. You can invoke the program where it is by specifying the full pathname, you could make a symbolic link to it that lives in a directory of yours where you have write permission, you could make a shell alias, add a directory to your search path, etc. If authentication was needed to make the program available for use, the proposed symbolic link wouldn't provide it.

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