Palm Beach International doesn't hand you a nonstop to Malpensa, and after dozens of trips on this exact corridor, I've made peace with the connection as part of the ritual rather than an inconvenience. There is no nonstop business class from West Palm Beach to Milan; every itinerary routes through a major hub, with Delta funneling through JFK or Boston, American through Philadelphia or Charlotte, and United via Newark or Chicago before the transatlantic hop, which typically clocks in around 9.5 hours once airborne. My preference has consistently been Delta's JFK connection, since it allows access to Delta One suites on the A330-900neo or A350 on the long-haul leg, both featuring full-suite doors and Westin Heavenly bedding that make a genuine difference on a red-eye into Europe. United's Polaris product, especially on the 777-200 or 787-9 out of Newark, runs a close second, with its recessed, staggered seating and Saks Fifth Avenue-designed amenity kits.
The insider move here is building in at least a 90-minute buffer at your connecting hub during winter months, since PBI's smaller schedule means missed connections from weather delays up north can strand you without same-day rebooking options — something frequent flyers on this route learn the hard way. American's routing through Philadelphia puts you in Flagship Business on the A330 or 777, and if you have status, the Flagship Lounge in PHL is worth the layover alone before continuing to Malpensa. Arrival into MXP is straightforward if you're checked through to a single PNR, but I always recommend clearing customs with carry-on only when possible, since Malpensa's baggage carousels can lag on peak Friday and Saturday arrivals from the US.
January through March and again in October and November are consistently the sweet spot for this route, both for award availability and softer transatlantic demand before European summer travel spikes. Given how much these fares swing with hub connection timing and seasonal demand, I'd strongly suggest setting up fare alerts rather than manually checking, since business class inventory on the PBI–MXP corridor tends to move quickly once a good release hits.