I'm checking FRA-LHR on a random date using Apollo ITN with time set as "any" or 00:00. If I don't specify a carrier then the only result I get is an AeroMexico codeshare flight on Air France via Paris. Slightly bizarre, isn't it?
If I specify BA as the carrier then I get those carrier's flights listed but they are listed after the same AM/AF flights through CDG.
If I specify LH as the carrier it seems to work as designed.
Any idea what's happening?