Take the job with GS.
You can become a pilot later in life, as I did, but it's unlikely that you'll get a job in GS later in life after leaving flying if it doesn't work out. The aviation industry is cyclical and we've had the high. My company, plus many others, are starting to baton down the hatches already. The next downturn is on the horizon.
You can still short in the years ahead and come out on top!