I'm not too concerned about flexibility, but I do collect miles. Looking back thru recent weeks' e-tkts for LHR/AMS/LHR, the only fare class I didn't get 100% miles for was V last Friday, which was 25%. L, K, T & N seem ok.

<rant>

And it was the last flight back on a Fri night ... and it was absolutely full ... of screaming children ... and backpackers who'd been in the bar too long ... and I didn't get home until 10pm ... grrr

That's the last time I agree to help out our office manager "because it's 50 euros cheaper". I welcome people taking a weekend break in my country, I just don't want to fly home with them

</rant>