PC Flying with Mouse and Keyboard

KB + mouse 

Yaw = A / D

Pitch Up = Space 

Pitch Down = L SHIFT (can use L CTRL instead)

Alternate you can reverse: 
Pitch up = L SHIFT (can also substitute  Left CTRL)
Pitch Down = Space 

Roll = Mouse

W = throttle up

D = throttle down / brake

fire = left click

switch weapons = mouse scroll 

switch weapons = also can use mouse 4 or 5

zoom = right click (I set mine to hold) 

can set afterburner to either Z, C, or L ALT

Set free look and cockpit mode / free camera so its within easy reach of left fingers while resting on WASD

notes: I used to use pitch up on W and down on D, but found (for me ergonomically) since most of the time you are climbing (diving) hitting space and L SHIFT to dive is easier. 
and mouse set to roll

That said, I'm too used to flight sims and HOTAS, so for BF 1 till now (skipped 5 n 2042 but peeps tell me I missed out in 5 since a/c were good in 5, and 2042 I got into it for BF 6 battle pass and wanted to learn flying so I flew stuff there), so I use  a controller for aircraft and mouse and KB for infantry / ground vehicles.