Small Antenna for Onboard use?

[Radio2.0]

Hi
I travel from time to time onboard an Aircraft. Here in Europe the often have Wifi with good rates.
So why not share from an aircraft like a AWACS?  I tried 3 Years ago and the worked great.
The main problem for short range flight is the Antenna must be "stealth" and fit under the Sunshade.

I found on ebay the common rubber one. Are the legitimated 1090Mhz or just some 900Mhz GSM Antenna?