There does not seem to be anything theoretical about the lounge access case. AA, DL and UA all bundle lounge access with a card, it's typically less expesive than buying a membership, they don't give complementary lounge access to most flyers on domestic routes, regardless of class of service, and none accept Priority Pass.

For AA status-based access (PLT or EXP),* passengers must: (1) be traveling on an international itinerary (Europe, Asia, Central and South America, and Mexico City, excluding the Caribbean and other destinations in Mexico), and (2) have an onward flight on a oneworld airline marketed and operated flight on the same day. PLT members are eligible for access to all oneworld Business Class lounges, including Admirals Clubs; EXP members are also eligible for access to all oneworld First Class lounges, including Flagship Lounges.

1.5X Membership Rewards® Points

You get 1.5 Membership Rewards® points per dollar (that's an extra one-half point per dollar) for each single qualifying purchase transaction of $5,000 or more made with your Business Platinum Card®.For example, for a single qualifying purchase transaction of $5,000, you will get an extra 2,500 points. These extra points are in addition to any points you already get from using the Card. You can get a maximum of 1,000,000 extra points associated with this benefit per calendar year per account.

You will not get the extra points associated with this benefit if American Express does not receive information that identifies your transaction as qualifying for the benefit. For example, a purchase transaction of $5,000 or more will not qualify if the merchant divides the purchase into transactions of less than $5,000 before providing the information to American Express. Airlines, hotels, retailers, aggregators, and online marketplaces are a few examples of merchants that may divide purchases into smaller transactions. Transactions may be divided by date of availability, shipping date, ticket, or reservation, among other things.

Qualifying purchases do not include fees or interest charges, balance transfers, cash advances, purchases of travelers checks, purchases or reloading of prepaid cards, or purchases of other cash equivalents. You will typically receive the extra Membership Rewards points six to eight weeks after the billing period in which you make the qualifying purchase.

50% Airline Bonus

To use Pay with Points, you must charge your eligible airfare purchase through American Express Travel to a Membership Rewards® program-enrolled American Express® Card. Points will be debited from your Membership Rewards account, and credit for corresponding dollar amount will be issued to the American Express Card account used. If points redeemed do not cover entire amount, the balance of purchase price will remain on the American Express Card account. Points must be used at the time of booking. Pay with Points requires a minimum redemption of 5,000 points.

Business Platinum Card Members will receive 5 extra points for every 10 points they redeem for either a First or Business class flight on any airline, or for flights with their selected qualifying airline using Membership Rewards Pay with Points with American Express Travel (50% Airline Bonus). For First or Business class flights on a Card Member's selected qualifying airline, the Card Member will still receive only 5 extra points for every 10 points redeemed. Card Member must select a qualifying airline at www.americanexpress.com/airlinechoice. Only the Basic Card Member or Authorized Account Manager(s) on the Card Account can select the qualifying airline. The airline you select for the 50% Airline Bonus and the $200 Airline Fee Credit must be the same. Card Members who have not chosen a qualifying airline will be able to do so at any time. Card Members who have already selected a qualifying airline will be able to change their choice one time each year in January at www.americanexpress.com/airlinechoice or by calling the number on the back of your Card. Card Members who do not change their airline selection will remain with their current airline.

If you select Spirit Airlines, Southwest Airlines, or AirTran Airways, to receive your 50% Airline Bonus you must call Business Platinum Travel Service at 1-800-553-9497. A flight booked as part of a travel package or booked with the American Express U.S. Representative Travel Network is not eligible for the 50% Airline Bonus. In addition, to be eligible to receive extra points, Card account(s) must not be in default at the time of extra points fulfillment. If booking is canceled, the extra points will be deducted from your Membership Rewards account. Extra points will be credited to your Membership Rewards account approximately 6-10 weeks after charges appear on your billing statement. See membershiprewards.com/terms for Membership Rewards program terms and conditions. This 50% Airline Bonus is the maximum Membership Rewards points you can get back for Pay with Points on flights booked with American Express Travel. Bonus ID: A6ZB.