Originally Posted by G-BUSI

I’m really intrigued by this and hope someone can explain. For clarity not a BA flight involved.

A 737-800 today from EDI to LPA (LS715) took off and flew the whole journey at 25,000 feet refuelling at FAO

The delayed return (LS716) is currently airborne and flying back at 24,000. Unsure if it plans to refuel on way back.

What could be the reasons for this to happen? It is obviously perfectly safe or the flight would not be operating, I’m just intrigued and did not know where else to ask so hope some of our friendly staffers can explain.

Thanks