Received a call from this number last evening. The "kid" on the other line was unprofessional and a bit nervous. He did say the survey was on behalf of the FAA regarding flight service stations. Looking back at the rather odd conversation this call did not seem legit.

When the machine picked up caller hung up.

I got a call from this number as well - showed up as ASVA.  I didn't answer, and no message was left.  Online,  ASVA LLC shows  to be a market research firm ( e.g., spammer).   While it appears they may be more ethical than most, I don't waste my time helping such firms "market" more stuff to me, so in blocking them as well.  

Got a call saying they were the FAA and wanted to talk to me....no way!!