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[Eagle of Fire]

Yeah, lack of elerium can be a pain.

You either need to hunt down landed Alien crafts (you are sure the elerium and the engines are still there), attack big crafts with normal weapons and hope one of the engines don't blow up or attack normal Alien crafts with low grade weapons.

There is also the option to attack Alien bases. You should get a good stock from those.

I prefer the former and the later. It destroys less of my own crafts, which are reserved for patrol duties and interceptions anyways.