check with the airline you are flying --- just before you go---the list of items you are allowed to take changes...and is different for different airlines- so it's important to check with the specific airline- it would be a bummer to loose a tool important to you...this happened to me- we flew out west- the airline we went on allowed sewing scissors 4"long or shorter- with sharp points.
i took a grandma's flower garden project to work on on the plane.
on the way back 2 weeks later my wonderful stork scissors were confiscated---the agent was VERY RUDE ABOUT IT when my hubby and i stated- they came with me in the same travel case as they are in now---just 2 weeks ago...
today- according to the rules you can have scissors up to 4" long- pins, needles, pin cushion...
to be on the safe side though i recommend doing all the prep work- so you wont need scissors- and pick up a little thread cutter pendant you can wear to snip threads.