Tus Dfw on RJ Canadair 50 seater (first time) on time and damn good could not stand upright in cabin, and shoulders hit overhead rack when walking down isle but once seated---NOT BAD, just as comfortable as a B737/B757 on DL or CO. V ery surprised and happy with the flight-nice F/A and far better service and attitude than the regular Delta flights to come. DFW to TPA DL757 --6 rows of F class seats and Y starts at row 20---looks like an old streched DC8 if you look back. Why so many F seats? All freebies-what a bunch. 100% full on all flights and looking for volunteers to get off. Same DL B757 cattlecar back. on both DL flights got 1 glass water and bag pretzlles on 2 hour lunch flight (4 flight attendants all stood in galley eating and chatting for one hour and fifteen minutes-a fifth sat and read a book) Since no meal servvice they have absolutely nothing to do....cant see this going on for to much longer. All flights on time and all bags arrived but departure from Tampa was a disaster. Arrived at airport 4 hours prior to departure-just made it. 30 min at DL tkt counter-good job all around but then had mile long line for C concourse stopped dead for 3 hours ??? why?? dont know but finally they started moving and let people in groups of 10 onto a train to the next terminal where 1 REPEAT ONE X-Ray machine was screening passengers for all the Delta flights. What a mess and DL has to bear some responsibility for this crap=they just dont wanna spend any money at all and it is making many passengers say ';never gonna fly again until they fix this security mess'[.