The reason that vast numbers of people fly these days is because flying is relatively inexpensive. Once the aircraft has been paid for, the big operating cost for airlines is the cost of the fuel, and fuel efficiency has increased by over 45% since the 1940s....
CITATION STYLE
Baker, I. (2018). Nickel-Based Superalloys. In Fifty Materials That Make the World (pp. 131–136). Springer International Publishing. https://doi.org/10.1007/978-3-319-78766-4_25
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