The problem was jumpseating in Dallas and JFK. In Dallas, gate agent flat refused to list me as there was already "too many jumpseaters" to a place in FL when I don't think there were any. At least not that I saw, i.e. no one in uniform, no purty neat bags, no one grabbing a used USA Today:-), etc. In Kennedy, jumpseaters must check in at ticket counter and once again, "too many jumpseaters". Just put a bad taste in my mouth, nothing against you guys, just being a little crybaby here because your gate agents were uncooperative. I didn't go to our jumpseat coordinator...Once again my friend, nothing against you guys, I'm just bitching because that's what pilots do.