They're Decepticons. I'd recognize their slimey contrails anywhere.
7 seconds sound clip from The Transformers (1984) - Fire on the Mountain TV Series.
You can hear this line at 00:00:47 in the DVD version of the movie.
Quote context
[...]
- Is it really over? I mean, have we seen the end of this war forever?
- Who can say? In this vast universe, is anything truly forever?
- Maybe I'm just spinning my flywheels, but those jets look sickeningly familar.
- They're Decepticons. I'd recognize their slimey contrails anywhere.
- Thundercracker, attention! Transform!
- No Earth-made steel is gonna be strong enough.
- I'm in charge here and if I say it's strong enough, it is!
- Great workin' with ya, Starscream.
[...]