i like to travel as much as i can to new fishing spots and have come to realise thats its often not the airlines that are the issue, especially when taking travel kit in hand luggage.
it is in fact the jobsworth "security" (and i say security in the loosest possible term!) persons.
its a low paid job that doesn't attract the most educated in society and doesn't help that a percentage of them struggle to read and understand their own regulations (which they often term rules! "its against the rules mate!")
i found it best to contact the airport authorities (and all differ although they should abide by the same regulations) and get an email or letter confirming you can carry rods/reels (and yes in fact line) in your carry on luggage.
However as i have discovered even with this things are never guaranteed, especially if little Adolf has had a bad day or Helga has pms
As a result if I'm carry gear i always turn up with at least an hour or so to spare in case i have to go at it with one of these neanderthals.
DISCLAIMER....
Ok not all airport security operators are Neanderthals but it seems that most surviving neanderthals are either airport security or traffic wardens