Cheap Flights from Portland Intl. to Minneapolis

Almost everything was great about this flight. I love Delta. The only 2 things that were frustrating for me: 1) The blue overhead lights that were on over this red eye flight. Made it difficult to sleep. I know they turned off, because they did so when we were descending and then it was finally dark. I would love for more darkness during red-eyes. 2) I wasn't able to select my own seat. I would love to be able to do this before checking in at th gate. Thankfully the service was helpful and accommodated me to an upgrade and aisle seat per my request. Thank you!