When I took up flying I still had small kids and a s*dding great mortgage and already had in place numerous life policies:I contacted all the providers who all told me that because when the policies were taken out (15 years previously), I at that time had no intention to fly then I would continue to be covered for flying at no extra cost.
As for Life insurance after you've started flying, be careful not to confuse 'Life Assurance' with 'Accident insurance'.
For example I took out a large life policy with income cover with Besso and supposedly on the basis of this flew for a coupla weeks in the USA a few years ago.
When I got back I realised that the policy did not include any medical costs/repatriation costs etc if I had had an accident. Certainly raised the hairs on the back of my neck.
Now when I travel to USA to fly I get travel/accident insurance from Traffords just in case it all goes t*ts up...............
And Renter's insurance too but that's a whole new can of worms..
Safe flying
Cusco