This guide will be going over what you're paying for when you buy new mercenaries or upgrades in the hiring den, both costs and what they fly. In the case of the airships, the armaments and how the upgrades change them.
Fighter Wing Contingent
Add additional fighter aircraft to your roster.
Rookie Pilot (Talon Wing)Aircraft: F/E-4 MK.I (Cascadian IF paint scheme)
Costs: $2000, $3500, $5000, $6500, $8000, $9500
Competent Pilot (Eclipse Wing)Aircraft: F/C-15 MK.I (Cascadian IF paint scheme)
Costs: $4000, $6500, $9000, $11500, $14000, $16500
Mercenary Pilot (Cleaner Wing)Aircraft: SK.27 MK.I (Cascadian IF paint scheme)
Costs: $8000, $11000, $14000, $17000, $?, $?
Frontline Ace (Rift Wing)Aircraft: F/C-16 MK.I (04 - Sicario paint scheme)
Costs: $10000, $13500, $17000
Infamous Ace ()Aircraft: F/S-15 MK.I ()
Costs: $15000, ?, $24000
War Hero (Inferno Wing)Aircraft: SK.37 MK.I (01 - Sicario paint scheme)
Costs: $20000, $25500
Airship Contingent
Anura MK.IArmaments: 2x AA, 2x SAM
Cost: 1x Cordium Engine & $12500
Arcion MK.IArmaments: 2x Railgun, 2x SAM
Cost: 2x Cordium Engine & $15000
Littoria MK.IArmaments: 3x AA, 3x SAM
Cost: 3x Cordium Engine & $17500
205 ClassArmaments: 6 CIWS, 6 ADV-SAM
Cost: 4x Cordium Engine & $20000
Airship Upgrades
Anura MK.IIArmaments: 2x CIWS, 2x ADV-SAM
Cost: 2x Cordium Engine & $19500
Anura MK.IIIArmaments: ?, ?
Cost: 3x Cordium Engine & $25000
Arcion MK.IIArmaments: 2x Railgun, 2x ADV-SAM
Cost: 3x Cordium Engine & $22000
Arcion MK.IIIArmaments: ?, ?
Cost: 4x Cordium Engine & $34000
Littoria MK.IIArmaments: 3x CIWS, 3x ADV-SAM
Cost: 4x Cordium Engine & $22500
Littoria MK.IIIArmaments: ?, ?
Cost: 5x Cordium Engine & $30000
205-A ClassArmaments: ?
Cost: 5x Cordium Engine & $30000
205-S ClassArmaments: ?
Cost: 6x Cordium Engine & $45000
W.I.P.
Source: https://gameplay.tips/guides/9073-project-wingman.html