Some airlines added private suites with privacy doors, double beds, high-end luxury amenities, and fine dining. Let's look at some of the world's most luxurious first class suites. The apartments are the second largest first class suites by square foot. Related The Only 3 Airlines Still Offering Luxurious VIP Suites On The Airbus A380 Few airlines offere a first class product. This particular first class product can be found on select flights, including flights from Singapore to London, Frankfurt, Delhi, Sydney, and Mumbai.