Just a quick post since I'm using the 787 for pretty much the first time, plus something I need to ask regarding the 747 on a flight I did a few weeks ago.
So first on the 787, is there a way to change the flight number displayed next to the artificial horizon? The FMS seems partially functional on this part as it lets you type in a flight number but once clicking ACTIVATE then EXEC(ute) it does not change. Just asking because the Triple 7 lets you type anything in and it would be nice to have a custom flight number displayed rather than what I've seen so far where it displays UAL123 or BAW787 as a generic flight number.
Second, I found the 747 struggled to keep speed at high altitude. Just on the Autopilot alone, not the inbuilt co-pilot, I took a Lufthansa 744 from Seattle to Frankfurt and found that at several points during the flight when I tried to get it to cruise higher than let's say 36 or 37,000 feet, it would just end up stalling/getting really low on speed (like 180 to 160 knots indicated, even) and I kept having to enable the GA thrust limit in order to get full power to maintain flight at FL410. Don't know what I did wrong, maybe I put it into the CRZ thrust limit a bit too early but at any altitude from 39,000 to 41,000 feet it just would not keep stable and level flight without becoming dangerously low on airspeed.