Mac AirPort (WiFi) and "promiscuous mode"

Interesting; I'm not sure when it happened or whether it's due to hardware or software (my money's on the latter), however:

I can now use Wireshark to capture packets over the built-in AirPort in a MacBook!

The Model Identifier is "MacBook4,1"; it's 2.10GHz 13.3" White, Model Number MB402LL/A.

And I'm using Mac os X 10.5.6 now.

Last time I tried, was with a 15" MacBook Pro (I think it was a 2006 model) and an earlier version of 10.5.

Whatever the reason, it's nice that simply attempting to use Wireshark (or, likely, attempting "promiscuous mode" in general) no longer renders the AirPort connection totally deaf, requiring something like switching Locations to recover.