Most airlines aren't just hoping you won't fight back - they're counting on it, and that's the real problem! Crew issues absolutely should qualify you for compensation in most jurisdictions (especially EU, US, and similar consumer-protection regions), but here's what everyone's glossing over: you need to file your claim directly with the airline first, and they'll almost certainly deny it or ghost you, which is when you escalate to a regulatory body or use a claims service. Don't sit on this - there are time limits (usually 2 - 3 years depending on where you are), and the hotel and car rental losses you mentioned might be recoverable too if you can show the airline's breach caused them directly, though that gets trickier. Document everything you have right now: confirmation emails, the cancellation notice, receipts, and any communications with the airline!