Under Construction

Crew Level needed before you can be train to become Expert
Rank 1 2 3 4 5
Crew Level 1 5 10 20 ?

Crew Level needed before you can be train to become Ace on top of a ridiculous amount of RP.
Rank 1 2 3 4 5
Crew Level 25 30 ? ? ?

Pilot

Keen Vision
Frontal detection ranges between 4km (untrained) to 8km (maxed).
Skill 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
Points 15 50 90 145 195 270 340 415 500 600

Awareness
Surrounding detection of enemy targets between 150m(untrained) to 300m(maxed).
Skill 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
Points 15 50 90 145 195 270 340 415 500 600

G-Tolerance
Resistance to G-LOC.
Skill 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
Points 22 64 110? 160 215 275 330 395 470 530

Stamina
Rate of recovery from G-LOC and accuracy in mouse aiming mode.
Skill 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
Points 22 64 110 160 215 275 330 395 470 530

Vitality
Increase health.
Skill 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
Points 27 80 150 225 320 415 520 640 760 890

Gunners (if you have)

Number of Experienced Gunners
The experience is shared equally if you have more than gunners than experienced ones.
Skill 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
Points 0 170 230 300 360 430 490 560 630 690

Fire Accuracy
Increases basically everything except accuracy of AI Gunners.
Skill 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
Points 12 29 55 80 110 135 165 195 235 265

Fire Precision
Increases the chance of simultaneous fire and accuracy of AI Gunners.
Skill 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
Points 12 29 55 80 110 135 165 195 235 265

G-Tolerance
Skill 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
Points 17 40 60 100 110 150 160 200 215 250

Stamina
Skill 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
Points 17 40 60 100 110 150 160 200 215 250

Vitality
Skill 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
Points 17 40 60 100 110 150 160 200 215 250

Ground Services

Repair Speed
Reduces repair time both at the airfield in the game and in the hangar by up to 3 times.
Skill 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
Points 12 35 55 80 110 140 170 205 240 275

Repair Rank
Determines the maximum aircraft Rank that you can repair with Repair Speed.
Skill 1 2 3 4 5
Points 0 120 240 390 590

Reload Speed
Reduces the rearming time cannons, machine guns, bombs, rockets and torpedoes and turrets during combat.
Skill 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
Points 16 60 120 190 285 385 505 640 780 930

Weapon Maintenance
Reduces weapons jamming and improve accuracy for bombs, rockets and torpedoes.
Skill 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
Points 22 64 110 160 215 275 330 395 470 530

Source from myself, War Thunder Wiki and War Thunder Forum.

Skill 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
Points ? ? ? ? ? ? ? ? ? ?