I don't know about extenders, but Newegg has plenty of cheap mics.
http://www.newegg.com/Product/ProductLi ... rder=PRICEThe one I use is very similar to the Cyber Acoustics CVL-1065B 3.5mm Connector Desktop Microphone listed.
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Also, I am reconsidering my personal aircraft choices for these routes. The New York - Boston one will be conducted in my YS-11 turboprop. The Poland - Russia one will still be in a jet, but I am currently looking for options other than the Tu-134. All I ask is that you bring something with similar performance. I did a Boston - JFK flight a few days ago in the YS, and I believe it took around 40 minutes, not counting waiting in a line of AI traffic.
So far, the time of 7pm US Eastern on this coming Saturday should be just fine. I will try to let you guys know if anything comes up that would prevent me from showing up.
I would suggest using real world weather for this trip, but if you are unable or just don't want to, that's fine.
A few other noteworthy items:
Aerosoft's AES service is free and fully active for Boston along with Gdansk, Poland. Highly suggested, but not required.
La Guardia Airport information:
http://www.airnav.com/airport/KLGABoston Airport information:
http://www.airnav.com/airport/KBOSGdansk Airport information:
http://worldaerodata.com/wad.cgi?id=PL32126&sch=EPGDKhrabrovo Airport information:
http://worldaerodata.com/wad.cgi?id=RS84082&sch=UMKK