I recently got back from a trip with 4 UA flights, all in K class, and all crediting to M+B as usual.

My flight to Fort Walton Beach was delayed by 3 hours (from 9 pm to midnight). The fun really started when the pilot tried to land, got down to about 200 meters and decided it was best to abort due to the very thick fog. After diverting to Jacksonville (1.30 am arrival) we were left on the aircraft for 3 hours as there was no ground crew to assist. We were finally able to get into the terminal building but it took a further 4 hours for them to arrange a bus back to Fort Walton Beach - a 5 hour bus journey. My original ETA at VPS was 9.30 pm but didn't actually get there until after 1 pm the next day.

After numerous e-mails UA offered a $100 voucher, which I subsequently found out was only valid on UA flights and not codeshares. I fired off another e-mail and was told that they would credit 5,000 miles to my Aegean Miles+Bonus account instead, which seems quite reasonable to me.