I travel to Australia but have never attempted to take knitting in my hand luggage (especially since that lady got her nearly completed baby shawl confiscated). The longest leg is 13 hours with a stop in between; I take my kindle, try to snooze, may watch a film, have a walk around, do some word puzzles, do some gentle exercises at the end near the toilets! You are 'in a bubble' so you just have to switch off from the outside world.
Your plastic hook should be fine rubysong. I must learn how to crochet before I go next!
Re dangerous objects, as someone pointed out, a CD bought in departures can be broken and made into a weapon which would be just as effective (probably more so) as a Gransnetter steaming through the cabin and attacking the crew with a bamboo knitting needle!
If they are not allowed to discriminate (fair enough) how come every time I go through I get called on one side and get patted down?
Being quizzed by chemist's assistant in Boots.