Mr. Chatterjee in this connection relied on Nokes vs Doncaster Amalgamated Collieries Ltd. where it was observed at p. 1018 "It is, of course, indisputable that (apart from statutory provision to the contrary) the benefit of a contract entered into by A to render personal service to X cannot be transferred by X to Y without A 's consent, which is the same thing as saying that, in order to produce the desired result,, the old contract between A and X would have to be terminated by notice or by mutual consent and a new contract of service entered into by agreement between A and Y." This observation itself shows that a contract of service may be transferred by a statutory provision; but in the present case, as we have already said, there was no compulsory transfer of the contract of service between the "existing air companies", and their officers and employees to the Corporation for each of them was given the option not to join the Corporation, if he gave notice to that effect.