Four US carriers fly Houston to Turks and Caicos business class, and the product differences are more pronounced than you'd expect on a sub-4-hour hop. JetBlue's Mint Suite, where available on this route, gives you a sliding door and genuinely good small-plates dining — a strong pick if IAH has Mint service on your travel dates. American's Flagship Business puts you in a 1-2-1 lie-flat suite with Casper bedding and Flagship Lounge access at IAH, useful if you're connecting rather than flying nonstop. Delta One Suite also runs 1-2-1 with a closing door and Tumi amenity kits, a consistently well-run cabin even on shorter legs. United Polaris rounds out the field with lie-flat pods, Saks Fifth Avenue bedding, and Polaris lounge access for pre-flight. On a 3.5-hour flight you won't sleep through a full turndown service, but the wider seat, real plate service, and lounge access before boarding still change the trip meaningfully, especially if you're heading straight into resort mode in Providenciales.