This page contains attack skills only A-gears have:
Air Siege: 
Level 1
Level required to learn: 55
Purchase Price: 25000 SPI
Sp cost: 3 SP/sec
Minimum and Maximum Standard Weapon Damage: +70%
Increases Radar range for Standard Weapons: +25%
Level 2
Level required to learn: 63
Purchase price:
Sp cost: 3 SP/sec
Minimum and Maximum Standard Weapon Damage: +76%
Increases Radar range for Standard Weapons: +25%
Level 3
Level required to learn: 69
Purchase Price: 39000 SPI
Sp cost: 3 SP/sec
Minimum and Maximum Standard Weapon Damage: +82%
Increases Radar range for Standard Weapons: +25%
Level 4
Level required to learn: 75
Purchase price:
Sp cost: 3 SP/sec
Continuous fire for Standard Weapons: +1
Increases Radar range for Standard Weapons: +25%
Level 5
Level required to learn: 81
Purchase price:
Sp cost: 3 SP/sec
Minimum and Maximum Standard Weapon Damage: +5%
Increases Radar range for Standard Weapons: +25%
Continuous fire for Standard Weapons: +1
Level 6
Level required to learn: 87
Purchase price: 567000 SPI
Sp cost: 3 SP/sec
Minimum and Maximum Standard Weapon Damage: +5%
Increases Radar range for Standard Weapons: +25%
Continuous fire for Standard Weapons: +1
Siege Mode: 
Level 1
Level required to learn: 20
Purchase Price: 12000 SPI
Sp cost: 3 SP/sec
Minimum and Maximum Standard Weapon Damage: +10%
Increases Radar range for Standard Weapons: +20%
Level 2
Level required to learn: 29
Purchase Price:
Sp cost: 3 SP/sec
Minimum and Maximum Standard Weapon Damage: +14%
Increases Radar range for Standard Weapons: +25%
Level 3
Level required to learn: 38
Purchase Price:
Sp cost: 3 SP/sec
Minimum and Maximum Standard Weapon Damage: +18%
Increases Radar range for Standard Weapons: +20%
Continuous fire for Standard Weapons: +1
Level 4
Level required to learn: 47
Purchase Price:
Sp cost: 3 SP/sec
Minimum and Maximum Standard Weapon Damage: +22%
Increases Radar range for Standard Weapons: +20%
Continuous fire for Standard Weapons: +1
Level 5
Level required to learn: 56
Purchase Price: 26000 SPI
Sp cost: 3 SP/sec
Minimum and Maximum Standard Weapon Damage: +26%
Increases Radar range for Standard Weapons: +30%
Continuous fire for Standard Weapons: +1
Level 6
Level required to learn: 65
Purchase Price: 35000 SPI
Sp cost: 3 SP/sec
Minimum and Maximum Standard Weapon Damage: +30%
Increases Radar range for Standard Weapons: +30%
Continuous fire for Standard Weapons: +1
Level 7
Level required to learn: 74
Purchase Price:
Sp cost: 3 SP/sec
Minimum and Maximum Standard Weapon Damage: +34%
Increases Radar range for Standard Weapons: +30%
Continuous fire for Standard Weapons: +1
Level 8
Level required to learn: 83
Purchase Price:
Sp cost: 3 SP/sec
Minimum and Maximum Standard Weapon Damage: +38%
Increases Radar range for Standard Weapons: +30%
Continuous fire for Standard Weapons: +1
Level 9
Level required to learn: 92
Purchase Price: 687000 SPI
Sp cost: 3 SP/sec
Card required: Final Skill Opening Card
Increases Radar range for Standard Weapons: +30%
Continuous fire for Standard Weapons: +2