Aircraft DEF I
Increase Aircraft Heroes' DEF
Max level: 5
Research levels
| Level |  Power |  Food |  Iron |  Coin | Base research time | Requirements |
|---|---|---|---|---|---|---|
| 1 | 1,800 | 419,900 | 419,900 | 1,259,700 | 2 hr 33 min |
|
| 2 | 4,600 | 1,099,300 | 1,099,300 | 3,297,900 | 14 hr 30 min |
|
| 3 | 9,600 | 3,561,300 | 3,561,300 | 10,684,000 | 3 days 12 hr 14 min |
|
| 4 | 19,400 | 13,461,800 | 13,461,800 | 40,385,400 | 11 days 18 hr 59 min |
|
| 5 | 34,100 | 30,625,600 | 30,625,600 | 91,876,700 | 27 days 21 hr 32 min |
|