UA: BOS-ARN RT May $399 4.5 cpm
Pretty good deal and great schedule. All UA metal, K class of course (KHNC14NT). 4.5 cpm for elites. 1 week min stay so maybe not the best MR though. Can do OSL for a few extra bucks (OJ).
https://www.google.com/flights/#sear...=STAR_ALLIANCE