yes. Probably because of the metadata capabilties?? I believe the broadcast waves allow a limited amount of metadata, but not as extensive or as convenient? I don't know, I'm guessing,
Wav and aiff are sonically identical. It is the same audio file. But the container for the file is formatted differently. If you convert with the same settings, eg. 16bit/44.1k to 16bit/44.1k the files should sound exactly the same.
Unless someone is looking specifically for more metadata capabilities, the only reason one would prefer one over the other would probably just be arbitrary since the audio quality of both file types is equal In my mind (which just can't understand the hype about sports) it seems a lot like how someone prefers one sports team over the other
Any program you might have that allows you to open a file (wav) and save file as (aiff).
It's fairly simple and standard conversion process. Open>Save As
The above program is free and open source, the default save even has the metadata page you may fill out or change entries if you so desire before saving.
In film/TV, 48K .aiff (or .aif, same thing) is pretty much the standard, usually 16 bits/48K. That is why MANY libraries ask for your files in that format. Just make sure you give the party the format/bits/sample rate they are asking for.
When a library asks you for that format, they are not being picky, they are asking you to give them the format their clients prefer so they don't have to spend their time converting files. Obviously, we'd much rather they be out there pitching our tracks than doing file conversions!
You can convert with many programs including iTunes, Audacity, Switch, etc.