[hi-v-rocknroll]

Expectation of success or profit = P(success)reward - P(failure)penalty - opportunity cost (TCO)

Supposed these panels were $100k/plane.

Jet fuel costs $0.36/lbs and a 777 burns about 30 lbs/nm in cruise. Suppose a 777 averages 14,000 nm/day. That's 420,000 lbs/day or $151,200/day. 1% savings would be $1,512/day, so the break even point would be roughly 2 months and would be profitable from then on. Suppose a 2 year lifecycle. That a savings $500k per year per plane.

Put a little more thought and data into your comments if you would be so kind.

[IshKebab]

Your back of the envelope calculation is off by over 10x, so I'm not sure it's him that needs to put more thought into their comments.

[hi-v-rocknroll]

Edit after-the-fact

P(success)*reward - P(failure)*penalty - opportunity cost (TCO)