Hi. I asked this question over in the Turkish Airlines forum, but nobody seems to know the answer, so I thought I'd try here.

I'm flying LH 7061 (IST to FRA) on July 26 in business. It's a codeshare on TK metal, flight number TK 1587. At the time of booking, the LH website indicated that the flight was on a 330 (it didn't specify -200 or -300). However, I've noticed on Flight Aware that the equipment regularly rotates among the 777, 330, and 321.

It's a short flight, but obviously I'd prefer the 330 (or especially the 777 with lie flats!) over a narrowbody. Are there particular days of the week where one is more likely to be downgauged to the 321?

Thanks in advance for any insights you can share.