Professional Indemnity insurance is written worldwide. Lloyd's is a big provider of this coverage, but these days there a number of traditional companies that usually prove to be competitive.
Get some advice, and think about your position. Are you a 747 Captain flying 400 pax, or a Lear driver for a freight company?
Are you flying in the US, or Europe? Could you potentially be sued for $2m or $200m?
You may be opening up a big can of worms by purchasing such a policy in the first place.
Perhaps those with these policies, or in such positions could comment?