I almost always book tickets for business travel 1-3 day before the trip. I am completely price insensitive (I do not care if my employer pays $100 or $400 for the ticket), my schedule is hard to predict ahead of time (if there are no important meetings on Monday, I will fly on Monday. If something important pops up I may fly on Sunday or on Tuesday). Downside is smaller seat selection (I mitigate by always checking if aisle seat available before booking) and sometimes convenient flights sell out.
My employer does some kind of credit system so we get cash credits for future trips which we can use for nicer hotels next time. Something like that. I don't fly often/ever. I should clarify the credit is the difference of the expected price vs what we paid. So if flight is normally 300 and we pay 200 we get 100 towards future travel. And then there are upper limits to what we can expense and the credits offset that.
I think Google does it now. One problem is see is that people may optimize for price tickets and not business goals to get bigger credit. Business need is 2 day trip but people may extend it by 2 days to get cheaper air tickets but on balance it will be more for the company due to additional hotel cost.
