Only if you've been paying more for flights to get on a specific airline. I can't remember doing that more than 2 or 3 times in the last 20 years. 80%+ of the flights out of my home airport were the same airline for many of those years, so I built up lifetime status. But since they cut back, my elite status has hopped around based on where my projects were and who flew there. I do tend to fly to the same city for 9-15 months at a time, and the most timely/cheapest airline to a city is usually pretty consistent. When I had to fly to IAH, I was CO PLT, DFW the last year or so, so AA PLT, etc.