Transit Visa
Guys,
If you are flying without having a valid H1,H4,L1 or L4 visa on your passports and flying through England, then you need transit visa for England. So, ofcourse Advance Parole needs a transit visa. Other countries in Europe don't need transit visa. It's not the airlines, it's the country which worries about the transit visa. If you are going by Air India and if goes via London, then you need a transit visa. Verify with the airlines before making a decision.
Verify whatever I say