Put it into context with how much email AJ's email address would receive...it has to be filtered somehow. It would be relentless and it is entirely understandable that someone hasn't gotten back to you.

I know with regards to EK, the best person to write to re compliments is the specific country manager or the VP of Inflight Services. This ensures the crew members have something put on their work file. I'd never expect a response if I wrote to Tim Clark.