I’m just gonna share how I do my Flight Planing instead of just liking random websites…
Step 1: I usually go to SimBrief, type in the Aircraft I’m going to fly, and Departure + Arrival airports.
Step 2: After doing so, I scroll down to look at the different FPL options given to me, and pick the one that suits my flight best, either because the real-life flight flew that exact routes or that it’s most economically saving.
Step 3: I press on Edit Flight, and then after it has loaded, scroll down to the bottom and copy the XML file.
Step 4: Now on to FPLtoIF.com, where I pick Simbrief Classic and paste in the FPL.
Step 5: Press on generating and Copy the generated FPL, and paste it into my FPL in IF.
One thing I do is check on the flight I’m gonna fly on FlightRadar24.com since I always do realistic flights, so I look up how the real-life flight behaved during flight, when it comes to speed, during climb-out, stp-climb and whatnot. And from there, I try my best to either replicate it or depending on my own aircrafts weight adjust the altitude flown at based on what my plane can handle.
The real-life plane may fly at FL330, then FL350, then FL370. last time it flew the route I’m going to replicate. But at other times it may have flown FL350, FL390, and then that’s that. So I do something similar, that will suit my flight, since the weight of my aircraft isn’t the same of the real-life one, as I don’t know how much cargo it carried, but I go for and approximate number there.
Example: ANA Flight 6, is what I’m flying now in IF, it usually flies something like FL310, FL330, FL350, FL370… But also flies sometimes, FL270, FL290, FL350 or FL310, FL340, FL350, so it depends on wind and weight.
I did, FL270, FL290, FL250, FL370, since that suited me and in favour of the tailwind over the Pacific.