Mango Plus and Mango Flex tickets are issued by Mango Airlines, and are geared at business travellers who require some flexibility in their schedule (but do not want to pay the business class prices of SAA or BA). The tickets allow the holder the flexibility to, without penalty, change (whilst there is no penalty, there will be an additional charge equal to the difference in airfare):
the time of travel
the date of travel
the name of the person travelling
destinations
Mango Plus tickets also provides:
entry into BIDAir Services AirportĀ lounges
drinks and meal onboard the flight to the value of R50 (at time of writing, may change)
an extra 10kg allowance for checked in luggage
(the 10% executive parking discount at Johannesburg seems to have fallen away)
Go to Mango, and do your Mango booking search from there, selecting the business option.