Our engine start, take-off and landing OAT temperature range extends between 30 C at 10,000' and 52 C at -1,000'. But that is ours. Other operators may have different limits and then we have to consider other operational limitations such as APU inoperable and/or the availability of air conditioning units. Therefore, more facts are required. What is certain is that airlines don't like passengers being given extended pleasure flights for free.
PM