I cannot recall a slower year:
In mid-February I did ATL-DEN-ATL on Southwest, and after that things started getting ugly. All trips, both domestic and intl got cancelled. However, now in December I had to do an essential 4 day trip to Stockholm. So I took DL from ATL to EWR in Comfort+ and SK EWR-CPH-ARN, returned on Sat with BA ARN-LHR-ATL all in J. Being a regular on AY 5 and AY 9, I never set foot on an A350 until SK910. LHR-ATL was a B789 so also a first for me.
If anyone is interested in hearing about the flights themselves then I'll post in the experiences thread.