Click on left side "admin" section of flight ops page and then top right "pilot selection"--info there on process and email to send recommendation to hiring team. I usually (but not always) have gotten a reply that my recommendation was received--sometimes this reply came in a day or two and sometimes it took a month.

They told us in indoc that you don't need to type a full blown recommendation. I have sent 6 in and usually limit my email to two or three sentences and then attach their resume. 5 have been interviewed and hired. We were told that this email basically guarantees that the application will get scored and then if high enough put in line for interview. My friends have waited 2 days to 3 months to get the call to interview. We were also told that airline apps recommendation is only looked after someone is called to interview but I've seen different info posted here.