Radio Tower isn't an Internet radio station itself but rather an aggregator of all of those smaller net-based stations out there.
Since podcasts are syndicated audio files that are distributed via an RSS feed, they work in the same manner as a typical blog feed or news aggregator, with one distinct difference: a podcast is an audio file.
Aggregator sites such as Kayak.com search more than 60 different travel sites and allow you to sort airfare results by departure time and price.
To obtain this feed, users register with an aggregator or web reader that in turn will scan the sites for updates and report them accordingly.
One way to compare options is by using a travel aggregator site to receive multiple quotes with one search.