"Texas Instruments' Marriott code TXI is a major semiconductor company code. TI HQ is in Dallas TX with major operations in Dallas, Houston, and globally. hotelcorporatecodes.com lists semiconductor/tech company codes at "⚠️ Sometimes" for Marriott. Properties near TI's Dallas-area campuses handle genuine TI employees regularly and may verify. No specific TXI denial documented in FlyerTalk. General Marriott enforcement: select-service essentially never checks; full-service urban 10-20%."

"I don't do mobile check-in if I'm wanting to upgrade. I check the app before I go in to see if any suites are available to book during the duration of my stay. If there is I just say "Would it be possible to get upgraded to an available suite with my platinum benefit?". Of course this is typically at the hotel that I stay in about once a month for 3 day at a time for work. The front desk pretty much knows me and know that I am fairly low maintenance."

"I work for the front desk, at a Marriott, & have for the last 8 years .... So when it comes to room upgrades; it goes based on AVAILABILITY... sometimes no matter the tier, if we have it available - I will upgrade the guest. Now of course, higher tiered members get dibs on the upgrades first but after we go through the higher tiered members, Ambassador, Titanium, Platinum - then we go through the other ones. I cannot express this enough : BEING NICE & POLITE AT THE DESK GOES A LONG WA"