If anyone has experience with Opera, please correct or chime in!
AXCL: Cancellation Policy Advised
ALRG: Allergy
ALSM: Allergy to Smoke
AMHK: Morning Service
ANNI: Anniversary
ASKD: Preferences Collected
AUTH: Letter of Authorization on File
AWAY: Away from Elevator
BABY: Baby Sitting
BDAY: Birthday
BLAN: Extra Blanket Requested
BUID: ID Required
BUSN: Business Plan
CARD: Courtesy Card
CLBX: Club Access Award Upgrade
CLUB: Club Access
COCO: Connecting Room Confirmed
COLL: Collect Certificate/Voucher/Award
CONA: Connecting Room Not Available
CORK: Cork Screw/Wine Opener
CORN: Corner Room Requested
DAYU: Day Use Room
DDBL: Double/Double
DHSK: Daily Housekeeping Service
DISA: Disability
DISH: Disability Hearing Impaired
DISM: Disability Mobility Impaired
DISS: Disability Sight Impaired
DISV: Discoverist
DONT: Do Not Walk Guest
EAGT: Early Arrival Confirmed
EMPL: Hyatt Employee/Colleague
ESTN: Pre-Arrival Room Upsell Not Available
ESTY: Pre-Arrival Room Upsell Confirmed
EXEM: Tax Exempt
EXPL: Explorist
EXTB: Extra Bath Towel Requested
EXTO: Extra Towel Sets Requested
FEML: Women's Experience
FOAM: Foam Pillow
FONE: No Phone Surcharge
GLOB: Globalist
HGMR: Hotel General Manager Referral
HIFL: High Floor
HONR: Guest of Honor
HONY: Honeymoon Couples
HYGI: Hygiene
IRON: Iron and Board
KGKG: Two King Beds
LATE: Late Arrival
LCOG: Late Checkout Confirmed
LGLO: Lifetime Globalist
LINE: Linen Change Daily
LOFL: Low Floor
LONG: Late Checkout
MEMB: World of Hyatt Member
MOVE: Do Not Move
MULT: Multiple Rooms in this Name
NEAR: Room Near Another Guest
NEWP: Newspaper
NOAC: No Alcohol in Minibar
NOFE: No Feather Product Requested
NOLP: No Benefits for World of Hyatt Guest
NONA: Non Allergic Room Requested
NONP: No Newspaper During Stay
NOPR: No Preferred Cleaning Time
NOSM: Non Smoking Room Confirmed
NOSV: No Service Requested
NERL: Near Elevator
PETA(My favorite LOL): Pet Amenities
PETS: Pet Fee
PETT: Pets
PINT: Premium Internet
PMHK: Afternoon Service
PREG: Pre-Register
QTRM: Quiet Room
RAZF: Female Razor Requested
RAZM: Male Razor Requested
RCHG: Rate Change During Stay
RCPV: Club Privledges
RECO: Reconfirmed Reservation
REFR: Refrigerator Requested
RELO: Relocation Guest Return
RENO: Renovation Advised
REYE: Redeye Arrival
ROLL: Rollaway Bed
SAME: Request Same Floor
SEWK: Sewing Kit Requested
SITE: Site Inspection
SMOK: Smoking Room
STAY: Stayover Requested
STEX: Suite Upgrade Award
SUIT: Suite Reservation
TURN: Turndown Request
UPCF: Upgrade Confirmed
UPRG: Upgrade if Available
UPS0: Upsell Club Room
UPS1: Upsell View Room
UPS2: Upsell Space Room
UPS3: Upsell Junior Suite Room
UPS4: Upsell Suite Room
UPSA: Upsell Spa Package
UPSB: Upsell Golf Package
UPSC: Upsell F&B Package
VIEW: View Room Requested
VIPP: VIP Guest
WAVC: Waive Cancellation Fee
WEBK: Online Check-In Key Issued
WEBI: Online Check-In Guest
WEBO: Online Check-Out Guest
XPIL: Extra Pillow Requested
As always, YMMV as some codes aren't regularly used. Some properties use STEX to refer to complimentary suite upgrades and UPS3/4 for Paid upgrades to Suites. Others use STEX to refer to GSU awards and UPS3/4 for complimentary suite upgrades.
Might be a reach on FT, but if anyone knows rate code definitions (like PROLP for FN certs) would be interested!