30% Amex-to-Avios bonus: Dublin business class for 39k Amex points.

Marriott's 50% buy-points bonus through September 9, 2026 drops the cost to 0.83 cents per point (USD) at max, but that's still above our valuation of 0.6 cpp. The play is not to stock up; it's to top off for a specific high-value redemption like Al Maha Desert Resort or JW Marriott Maldives where cash rates exceed $1,000 a night. The 200,000-point purchase cap (bonus not counted) means $2,500 nets 300,000 points at the 50% bonus, enough for two to three nights at aspirational properties. Transferring to airline partners at 3:1 with a 5,000-mile bonus on 60,000-point increments yields miles at 2.0 cpp, which is expensive but unlocks exclusive programs like Singapore Airlines KrisFlyer for First Class Suites.

American Airlines is back with a 10,000-mile enrollment bonus for AAdvantage Business using promo code BNS10K, running through Dec. 31, 2026. Last month's 25,000-mile offer was clawed back from everyone who got it instantly, with only 5,000 miles as consolation - so this is literally double the compensation but half the original promise. The terms require 5 active travelers and $5,000 in eligible program travel per year, though those requirements were waived for Citi American Airlines business cardholders last month; that waiver may not repeat, but if it does, this is an easy 10,000 miles. Bonus miles don't count toward status or Million Miler.