We noticed changes from the very start of the trip. We had to check in at the desk this time and experienced the rudest customer service we have ever had. Considering there was one person in line ahead of us, and no one else behind us, and we were 3 hours early for the flight, I can not see where there attitude was do to being overwhelmed with passengers. The employee floating around the Kiosks gave us the 3rd degree for our carry on bags, which are within the posted measurements. She also continued on her erroneous assessment stating that my husband's carry on could not possibly be under 40 lbs. We told her that we weighed it at home and it was around 20 lbs. She grabbed it, and I do mean grabbed it, with a huff and put in on the scale, only to have to eat crow as the weight came in at only 22 lbs. Our flight to Houston was as usual ... up and down, no refreshments or real service required. However, our flight to Bonaire was much different. Again, the desk attendents at IAH were rude. They didn't even look up to address us at the counter to pre-check our boarding pass. People we met at IAH also stated that the employees were rather rude. Once we were on the plane we found seating that was so tight it was ridiculous. I realize that this is the new way of air travel, but my knees were touching the seat in front of me and I am only 5'5". The flight attendants were grumpy and very impatient, barking orders and rolling eyes. And although I realize that traveling coach entitles a passenger basically no fringes, the least they could do is present their tray of water with a smile and be somewhat civil as they walk up and down the aisle jiggling the plastic trash bag. I also noticed that the plane was very dirty. Stained seats and dirty aisles, and this was a newer plane. The plane trip home was much of the same with the most filthy plane bathroom that I have ever seen. Overall, the best air travel experience I had this past trip was dealing with TSA, now that is saying something. They were at least courteous and smiled a few times. Now, perhaps the on board attendants for the Bonaire route are grumpier. However I must say that for the first two trips we made there , 4 and 2 years ago , everything was fine. Hopefully, we find that this negative experience was a fluke and that future United flights, especially those to CZM if we choose to fly this airline, will be different. Regardless, good luck to SW Airlines on this new venture. I hope it works out well for them.