I just had this last week on a pair of DL (SkyWest) CR7s: SEA-LAX-OAK-LAX on Thurs, and SJC-LAX-SEA on Sat ... then discovered when updating my logbook that I had two other DL CR7 flights in the past year (SAN-LAX in Oct 2012 and EUG-SLC in Nov 2013) on the same jet as the Thurs flights
also in the 2007 timeframe I did the ATL-ONT-ATL evening/redeye turn on DL 757 (UGs on both legs) with the same crew ... the outbound was a one-day-early departure on a business trip, the return was actually the first half of a relatively cheap BNA turn