Check their Requirements
here. For all non German speakers i post it here:
- Minimum age 21 years
- Fluent German and English in words and writing is a must!!!
- Valid E-mail address
- Valid medical certificate
- JAR license or German ATPL incl. Long Range (theory)
- Type Rating Boeing 737 or Airbus A320 with minimum 500 flight hours on the suitable airplane
Chances to get an invitation are very very low if you don't fullfill the requirements! If you should pass all tests and the personal interview then they pay for a type rating on either Boing or Airbus...