Ask your TA to give you a copy of the e-ticket receipt, or that you can get it through virtuallythere.com by clicking on the view e-ticket receipt. Then you can see if there is a segment for the missing JL flight. If it is missing there, then you need to contact your TA right away.

If the booking was made and ticket issued by Sabre, then everything should be there. Do not go to each airlines' website to check as corresponding flight info ( flights other than before/after what you are viewing - BA/QF flights )will not show up on their PNRs.