I've got an old Breitling Navitimer Cosmonaute which has a manual movement and a 24HR face - looks similar to an Old Navitimer.
It's beautifully accurate and the simpler manual movement (no date function) is rugged as h*ll.
I use it when travelling across a lot of timezones, as you can keep it on zulu and stay oriented.
But I'd never use it for flying, where a Seiko quartz chronograph does the job equally well and would cost a lot less to replace if it got bust or lost.
PS: Kingy, the Cosmonaute was developed for the Mercury programme when men were men
