Recently submitted ERAS on the 26th with 3 LORs (2 IM, 1 FM) and applied to around ~75 programs. About 10-15 of them explicitly mention the chair letter as a requirement. At my school, we don't have a chair of medicine to write the letters so we typically seek them out from our rotations. I had spoken to the chair where I did my IM rotation about 5 months ago and had constantly emailed/gone in-person to request the letter since then and they had pretty much promised to have it in on time. Unfortunately, they haven't uploaded it yet and now I'm feeling like I might be screwed. Apparently, they had told another student that they planned to upload all of the letters in mid-October. My question is, how much of a problem will this be going forward in terms of interviews? Do the programs that don't specifically request chair letters still expect to see them? Is mid-October too late for the chair letter even if the rest of my application is complete? I have no red flags that I know about. Thanks for your help.