Our reporter Andy Dickenson went to meet Mike and Debbie - up in the clouds
Mike lost his sight 11 years ago but had already completed five record-breaking flights.
At the helm of this flight will be his partner and endurance athlete Debbie.
If successful she will become the first woman to captain the 2,800 mile voyage.
The pair will spend five to 10 days in an open basket at heights of more than 15,000ft.
They will face freezing temperatures and even a lack of oxygen.