"NEC's Hyatt code (16733) is for the Japanese electronics and IT company. Hyatt Asia-Pacific enforcement is near 100% at Park Hyatt and Grand Hyatt properties. NEC has significant presence in Japan, where Grand Hyatt Tokyo enforces verification consistently. A FlyerTalk user with 40+ Hyatt stays across 10 countries reported 50% ID check rate overall with Asia being much stricter. NEC employees in Japan recognize Park Hyatt as a standard business travel tier, and staff there are similarly familiar with NEC employee credentials."

"I have a reservation in DC this weekend (11/14) and the LTO110 code showed up for it when I rechecked availability/rates. A call to GP customer service verified the rate and dropped the price 10% below what I'd previously booked. It does require a bit of clicking about on the site, but it's there. Under 'reservations', hit 'specials & packages', then the 'hyatt special offers' tab. The link to the LTO110 rate is the fourth one down."

"I use MY job's corporate code when booking personal travel. Most companies have a list of which hotels they contract with also allow personal bookings. If you're improperly using a corporate code, the hotel can cancel your booking or change your rate at check in."