Once you've experienced a $200 price spike in the middle of your ticket search, your fourth 45-minute flight delay of the day, or your bag going MIA in Miami, you can't help but think: what are these airlines hiding from me? It turns out, A LOT. Sure, some of it's coincidence, and you get an $8 voucher for an airport breakfast. But that overpriced breakfast is not an adequate salve -- and in fact, you've got a right to more than that. Here are 10 secrets airlines don't want you to know.

Say 'no' to vouchers -- you're entitled to cold, hard cash Do not settle for vouchers. They're the airline equivalent of Geoffrey Dollars. If you're bumped from a flight because it's overbooked, the U.S. Department of Transportation (DOT) has compensation rules of up to $1,300 in cash if the airline fails to rearrange plans within two hours of your flight. The airlines often offer passengers a travel voucher instead (like every time, let's be real). They're also required to tell you that you can get a check on the spot. It's like your flight-delay Miranda rights.

Even with new flight arrangements, you get cash If your airline can get you to your destination between one and two hours of your scheduled arrival on a domestic flight, or between one and four hours on an international trip, it owes you compensation of 200 percent of the one-way fare to your destination, up to $650. That was fast, but not fast enough, airline fiends.

Tuesday, Wednesday, and Saturday are cheapest days to fly, not necessarily to buy Airlines carry fewer business passengers on these days of the week, and thus there's often a surplus of seats. But don't confused this fact with the idea that buying a ticket on a Tuesday will result in lower airfare. That's a separate thing.

You can cancel within 24 hours for no charge Now, there are caveats, so don't go booking out an entire planeful of tickets just for S&Gs. For most airlines, you can cancel/change your ticket up to seven days before your scheduled date of travel and get a full refund. The notable exception: American Airlines, which instead allows you to hold a ticket up to 24 hours at the price you see. Additionally, you need to book directly with the airline's website, and not through a third-party booking site, although big ones like Expedia or Travelocity offer policies similar to those of airlines. But the big takeaway: you can have buyer's remorse for up to a full day. And some airlines -- like Southwest -- have even more generous refund policies that let you change plans up until right before you take off.

They owe you way more for delayed luggage than they'll offer to pay If your bag is delayed, not lost, airlines will try to placate you with $25 or $50 per day. But the DOT says it's not enough to salvage a wedding, a ski trip, or an important business trip. These companies can owe you up to $3,300 in liability for a domestic U.S. trip, so long as you've got receipts to prove you needed that stuff. Looks like upon arrival, a new tuxedo is in order. (You always wear Armani...)

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