* ''[[ US Postal Service - Mail Hold | https://holdmail.usps.com/holdmail/ ]]'' . . . . .  Don't forget to have your mail held!
* ''[[ Time | Time ]]'' . . . . .  So you can coordinate times while apart.
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* ''[[ Cheapo Air | http://www.cheapoair.com ]]''
* ''[[ Hotwire | http://www.hotwire.com ]]''
* ''[[ Kayak | http://www.kayak.com ]]''
* ''[[ Travelocity | http://www.travelocity.com ]]''
* ''[[ Trivago | http://trivago.com ]]''
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* ''[[ Planefinder | http://planefinder.net ]]''
** ''[[ Planefinder Routes | http://planefinder.net/route/ ]]''
* ''[[ FlightRadar24 | http://www.flightradar24.com/ ]]''
* ''[[ Shipfinder | http://shipfinder.co ]]''