I did enough mileage runs to upgrade from GM to PM and, as soon as I reached PM, DL slapped the no upgrades restriction on L fares. Gosh, I'm sorry that I can schedule my business travel far enough in advance to qualify for L fares. My choice then was to pay $400 for a $200 ticket or give all of my business to UA. I now have no status on DL and UA hates me as a 1K because I buy the $200 tickets and then have the nerve to upgrade. Next year, I'll give Greyhound my 100,000 miles.
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Biggest Little 1K (in The Biggest Little City) In The World