What about my rock-climbing partner, and my musician friends (some of the stuff we do can be done over the &#x27;net, but we can&#x27;t jam remotely)? I guess these all fall under the category of &quot;take a plane&quot;? It certainly contradicts the spur-of-the-moment environment facilitated by cellphones though, whereby we tend to make plans just a few hours before meeting up.<p>Keeping in touch is definitely possible, but those types of friendships would become nearly unrecognizable if we&#x27;re separated by a plane flight.