FFF,
Thanks for that (at least I'm doing something right anyway

I know I didn't say so in my last post, but I'm actually finding this thread very helpful. I'm off to the States in 3 weeks time. I'm staying there for 3 weeks and I'm going to incorporate some pleasure flying over there in California & Arizona. I've been talking to some friends who have flown out there and they have been sharing their experiences of joins and RT etc. I gather there are numerous unattended fields, so I'm sure I'll encounter the scenario you pointed out where I won't be able to talk to anyone at my destination field before I leave.
Reading the discussion about these various joins has therefore been both interesting and helpful. Thanks again for your comments FFF.
Goose.
p.s. I'm also doing a 3 day Upset Recovery Training course in an Extra 300L, so it promises to be a memorable holiday