I was contacted by Tropic Ocean Airways to complete my application through Airline Apps if interested to have my information evaluated. I replied stating that I just had my credit card stolen over the internet and I didn't feel so comfortable on disclosing so many personal information in a third party site. Wondering for future reference how many companies are using AirlineApps to initially screen candidates?

"How many companies are using AirlineApps to initially screen candidates?"

Enough

It’s a reputable website, there are plenty of airlines that use it (United, Delta, etc).