I can't find stats anywhere for the most common Naval aircraft, so I threw some together because I plan on using them in my future Only War campaign.
Lightning Fighter
Size: Enormous (+20 to hit)
Armor (AP): Front 20/Sides 20/Rear 20
Structural Integrity (SI): 20
Tactical Speed: 24 AU
Crew: Pilot
Maneuverability: +15
Weapons:
2x Wing-mounted Lascannons (Range 300m (3 AU); S/-/-; 6d10+10 E; pen 10; 30 rounds)
1x Long-barreled Autocannon (Range 500m (5 AU); S/2/5; 4d10+5 I; pen 4; 200 rounds)
4x Hellstrike Missiles (Range 75km; S/-/-; 3d10+20 X; pen 15)
Thunderbolt Heavy Fighter
Size: Enormous (+20 to hit)
Armor (AP): Front 25/Sides 25/Rear 20
Structural Integrity (SI): 25
Tactical Speed: 22 AU
Crew: Pilot
Maneuverability: +10
Weapons:
4x Long-barreled Autocannons (Range 500m (5 AU); S/2/5; 4d10+5 I; pen 4; 200 rounds)
2x Wing-mounted Lascannons (Range 300m (3 AU); S/-/-; 6d10+10 E; pen 10; 30 rounds)
4x Hellstrike Missiles (Range 75km; S/-/-; 3d10+20 X; pen 15)
Marauder Bomber
Size: Enormous (+20 to hit)
Armor (AP): Front 30/Sides 30/Rear 25
Structural Integrity (SI): 30
Tactical Speed: 18 AU
Crew: Pilot, Navigator, Bombardier, Nose Gunner, Tail Gunner, Turret Gunner
Maneuverability: +5
Weapons:
2x Nose Turret Lascannons (Range 300m (3 AU); S/-/-; 6d10+10 E; pen 10; 30 rounds)
2x Rear Turret Heavy Bolters (Range 120m (2 AU); -/-/10; 2d10 X; pen 5; 500 rounds)
2x Dorsal Turret Heavy Bolters (Range 120m (2 AU); -/-/10; 2d10 X; pen 5; 500 rounds)
Either 12 bombs, 6 heavy bombs, or 2 Hellstorm incendiary bombs