Next: on to Sue's idea for keeping the quilt tin in place.
As I had neither elastic nor poppers I used what I had - some woven tape and pieces of velcro.
As you can see, I didn't wrap the straps around the tray table - but instead around the arm of my chair. I was glad the straps were quilte long as this was quite a 'chunky' armrest.
It worked perfectly - the items I needed were immediately to hand and not once did it slip - even during some pretty hectic turbulence. The straps worked well - I'm not sure elastic would have worked better or not. The only thing I can say is that there is quite a lot of variation on the plane with regard to tray and arm rest styles. Depending on where you sit and the type of plane you are on there are lots of different places you may need to attach your pockets and tin. By giving yourself lots of options with long straps or elastic you will surely find somewhere to put your essential equipment!
One last thing - at no stage did anybody challenge me with regard to sharp or pointy objects - I have yet to try this out on a flight to the USA - but in a few months time I will be travelling that way - so I will let you know how I get on then.
In the meantime - if you are planning a long journey, why not try making a tin, pouch or pocket to make your stitching life easier? Not only is it practical, but it is a very pleasant way to while away those long hours sitting in a very confined space!
This is roughly what I made..............................