Strong Glue

I agree with adding a pin or two to strengthen the joint. I've cut small pieces of brass rod and drilled holes into the mating surfaces with a pin-vice and super glued them into place. I've used this method with great success on 1/72 landing gear struts that have broken.

Bob

I would insert a pin or two for sure if the parts are that thin.

Your pins should fit snuggly but not so tight that you have to force them in. I said brass rod but any metal rod will do (I've use bits of paper clip and straight pins to name a couple). I would make sure that the rod is not more than 1/2 the thickness of the parts your inserting them into.

 Thank's Woody for the info on reinforcing I will try it, even if the part is sort of small about 1/16" thick, If I didn't mention it Im sorry. the part that is  broke in half is a stabilizer for a Dash-8 communter airliner, it sits on top of the fin in case it will help.  

Epoxy is a good choice for strength but sometimes the answer isn't so much the glue but to reinforce the joint. Both epoxy and CA glues can provide a strong bond but may not offer the strength needed. By backing the the joint with small strips of styrene or inserting short brass rod pins, you will make a much stronger joint. I work with resin and it is very brittle compared to styrene so reinforcing joints is a skill you learn or you get used to repairing your displayed models.

 Phil 

    will that two part epoxy idear work with mending a broken stabilizer,My dash-8 communter airliner's stabilizer broke right down the center where it joins the top of the horizontal stabilizer and the CA glues are holding up it keeps breaking in half again, when I try to sand it,or is there any other glues that are strong enough to bond the part  

Ditto to what Phil said.

Try a 2-part epoxy for more strength.

CA has reasonable tensile strength, but little shear strength and shock resistance.