I'm afraid the points made by Barling Magna and Expressflight, whilst perfectly valid, will have little traction with the new Madame Executive Chairman of Stobart.
Her main concerns will be the strategic direction of the group, the use of management time, and the allocation of capital. If she considers operating aviation infrastructure is too different from the core business (road haulage & logistics), she may decide to sell. Also, if the group can achieve a better return on capital in haulage, she may choose to realign the business there and sell.
Aviation is unlikely to become the core business for Stobart - the best SEN can hope for is that she decides to retain the aviation assets (Aer Arann, SEN and Carlisle Airport) and place them in a separate division.
My personal view is that the least attractive asset is a small regional airline, operating as a franchise, and with no effective identity of its own.
Aviation is a business that Stobart has entered almost by chance - having seen an opportunity or three and taken them. Carlisle Airport is really about building a distribution depot in their home town, and buying SEN was an almost-logical extension of that. Then taking a stake in RE from examinership to create 'business' for a newly-developed airport was logical but perhaps not sensible.