Han displays his unorthodox tactical skills leading the Rebels' stolen shuttle through the Imperial defences. "Keep your distance though, Chewie, but don't look like you're trying to keep your distance."
As Seen In:
Return Of The Jedi
When Chewie questions what the heck he's talking about, a laidback Han shrugs and says, "I don't know, fly casual."
If It Had Been Luke:
Given how jittery Luke is aboard the shuttle anyway, he'd probably have crashed.