Connecting in FRA on 12/31, flying business class. Arrive in unsecured Z from JHB at 5:15am, and fly to JFK out of Z at 11am. That’s almost 6 hours. With the Z business lounge closed, was debating doing the Arrivals welcome lounge in landside, or the A lounge. Either way, will have to go through security one (arriving into unsecured) and pass through immigration twice (non-EU). Advice on the two options?