Last year, DS took a trip to Germany with his high school German class. The kids were encouraged to take Montana produced gifts for their hosts. I packed huckleberry jam for DS. Other kids took huckleberry products too and one girl packed both jam and syrup. I spent almost an hour packing the jams into a very padded box and put the box in DS' checked suitcase. At our local airport, they ran the suitcase thru xray and the jam showed up. They pulled it aside to open it. I told them it was jam and to please keep it intact so it would not break on the long trip. They insisted and told me everything would be "fine".
When DS came back home...he told us "the rest of the story". They had opened every suitcase that had what appeared to be a jar of jelly or jam in them. They put them back into the suitcases, without any of the packing materials they had been previously packed with. DS's clothes were fine. Some of the other kids who had packed huckleberry products weren't so lucky. One girl had had both syrup and jam break open and stain all of her clothes with the dark purple fruit.
In some cases, I think the airport security goes too far. If the suitcase is not over the weight limit, and they find the items packed are not a threat, they should leave things the way the owner has packed them.
If you chose to pack jelly, put them in a couple of zip lock bags (inside each other) and see if they will leave them like that. They would be able to see the product through the plastic and your clothing would be protected.