Loss of Licence Insurance
As stated above - it all depends on the employer. Some have excellent loss of licence insurance schemes, some have mediocre ones and some have none at all.
NATS current scheme is the best I know of in the UK as it pays the difference between your pension income and your salary at the date of loss of medical until retirement age.
It may not seem a big consideration when you're 25 and wondering if NATS is the place to be. The future is an unknown quantity and a good LOL scheme can be the difference between a financially secure medical retirement and a very impoverished existence.