"Air" is not a standardized GUE gas - so "deep air" is not an answer which should be on this forum at all really.
But i'd be curious to see if/how the experienced 'dir' divers have managed this in the fancy and nice places around the world
I'll give you my answer for this though.
You have to look at the entire dive plan and the adviability of gas.
In hawaii, most places in the carribean, and almost all normal dive vacation spots, 32% is advailable at an added cost, I factor it into my dive resource planning and just dive 32% with a MOD of 100 fsw. 80% of my dives in locations like that are in the 60-80 fsw range anyway so there is no hinderence in the gas choice.
In places like india where 32% is Not readily advaialble, Goa for instance- i look at the plan and adjust my MOD to accomidate, the main sites are ~45fsw. Anything deeper or longer duration would not be attempted or planned given the gas advailbility issue.
Truely exotic locations such as Bikini Atoll, the soloman's etc require advanced planning for gas advailability and that has to be taken into account. no way i would plan or get in the water on a 150 fsw dive with just air in my tanks, I don't care where i'm at.
For something in the 0-150-175 range (Bikini Atoll) you would use a MOD 200 std gas i.e. 18/45 as back gas, and travel gas as appropiate to dive time, 50/50 or 100% deco gas.
Plan for it to be advailable, which requires work on your part to make it happen.
The easist thing in the world to do when your unsure, is to ask, call the dive operator and talk to them about the plans, sites, gas advailability, etc.
Just showing up and expecting it to be there is not going to work or worse is going to lead you to making a potentially fatal decision about doing a dive with the wrong gas i.e. a "Deep Air" profile.
If you can't get the right gas for the plan, change the plan to a shallower site or don't go.