Fly what you want to fly. Go slay your dragons early while your younger and full of gusto. Either go fast and furious doing the fighter thang and truly enjoy it, worry about that airline gig later, or
$$$ wise - Fly Fast jets, go regionals to accumulate not only quicker, but Part 121 time which undeniably helps secure an airline gig (seniority number earlier perhaps/friends help as well), but is not required.
The mobility side runs 90% or greater real world missions on a weekly basis and trains 10% or less of their time.
Fighter gurus do their kick butt flying most of the time but maybe 10% real world (meaning actual engagements, as defined by y’all) and train 90% of the time for that close encounter/real world event/deployment preparing to save the world as we know it thankfully.
I am definitely off base on the exact percentages, but not way off as (having been privy/leading teams at the NGB/ANGRC) to how the flying hour programs were divided among units using O&M dollars annually / POM cycle. The differences between flight hours for training / RAP, etc and actual mission hours (different colors of $ per say) varies significantly on unit mission assignment at times. That being said, hours don’t accumulate like heavies as they drone for hours from A, B, C, D, etc.
You want to fly fighters, do that work and fly fast and the rest will work itself out. You will have Fighter Pilot/Airline contacts in your unit and off the reservation. All Military pilots with good record are highly sought after and the airlines sources are dwindling...