Kiwi Guarantee is Kiwi.com’s disruption protection product that covers your rebooking costs if a missed connection occurs on a Virtual Interlining itinerary. Because self-transfer routes are not protected by any single airline’s standard rebooking policy, Kiwi Guarantee fills that gap. For travelers booking Virtual Interlining routes with tight connections, it is worth adding to your booking. For standard single-airline routes it is less necessary.