Glitch would get fixed real quick if we denied the "recriprocal" jumpseat agreement to DAL pilots. SKYW pilots lack the will to stand up for themselves. DAL pilots are welcome in my jumpseat only, if they want to sit in the back they can buy an ID or find another ride.

"re·cip·ro·cal
rəˈsiprək(ə)l/

(of an agreement or obligation) bearing on or binding each of two parties equally.
"the treaty is a bilateral commitment with reciprocal rights and duties"
synonyms:mutual, common, shared, joint, corresponding, complementary "reciprocal obligations and duties"

They need us far more than we need them.
BTW, ran this by a CP and he said the jumpseat was under my discretionary control.