UK suitwearing engineer, working nominal office hours (that's about 9-8, five days per week - although the contract says 35 hours).
28 days plus public holidays, although rarely do I manage to take all 28 days, since the nature of the job is that there's a fair bit nobody can/will cover.
I had an interview with Learjet last year (sadly didn't get the job as almost simultaneously Bombardier - the parent company laid 2000 people off, which rather mucked up recruitment plans) in Wichita. The arrangement there (again for salaried suitwearing engineers) was no leave for your first year, 10 days per year for the next ten, after which it slowly crept up to 20 over another 15 years I think. Hours were about 8-7. Plus public holidays.
No overtime in either job, nor my last, although the last did give time and a half in lieu for weekend and bank holiday working - not the case in the new job (although less call for it).
G