Sounds like my recent experience on SkyWest dba DL Connection. This has happened more and more recently, even on mainline. This is completely unacceptable and we cannot standby and allow it to become "normal." If you don't fly DL and complain very often, it's worth complaining via the comment/complaint link on DL's website. They will throw some miles your way. My companion complained about the OO FA's laziness, and DL sent us 10K miles each. Otherwise, if they email a post flight survey, its worth filling that out and writing your concerns in there.