A lot of that then comes down to "equivalent for what".
Is my BEng equivalent to a BA? Technically yes. However, nobody but an eejit would accept me onto a postgraduate degree in most humanities subjects, nor a BA History graduate onto a postgraduate degree in Engineering.
So an ATPL + industry experience *can* be equivalent to a bachelors degree, very narrowly and specifically, for admission to an MSc in air transport management. But I'd not accept them onto an MSc in aerospace engineering, as they clearly won't have most of the undergraduate engineering knowledge I would want to see.
The PGCE's interesting - I think that the big question would be whether you'd accept that ATPL holder on the basis of their subject knowledge. For most secondary subjects - I'm sure absolutely not. For, say, primary teaching, maybe a case could be made? If the plan is to use the course for teaching ATPL groundschool at somewhere like BNU - why not?
G