The code given by Kirsch to Robert Langdon before his show.
What does this code BIO-EC346 means ?
SPOILER Alert, don’t read the paragraph above if you don’t want to be spoiled.
It is actually the code of identification of a private jet. It is discovered from Chapter 32.
BIO = Bilbao Airport
EC = ICAO registration prefix. For Spain, the prefix is EC.
346 = Number of the aircraft.