JET2 has a very busy summer season and a much quieter winter. Due to planned growth for the summer of 2011 the fleet is expanding by 2xB738NGs, 1xB733 and
2x B752s. JET2 own most of their present fleet and some recent additions have been leased. With a quiet winter programme it would suit the finances of the company to lease in the summer and return the aircraft in the winter. It would appear that the 2 B752s will probably be leased, not bought, from Allegiant Air for the summer and then returned to them in the winter to operate flights to Hawaii for the Allegiant Air winter programme.
If this is in fact the deal with Allegiant Air and it works out favourably for both companies during the summer of 2011 and winter of 2011/12, then there would be more opportunities for leasing B752s for JET2's growth in future summer seasons, as Allegiant Air has committed to take about six B752s for their future winter sun programme.
It would make it unlikely for JET2 to buy or lease B753s from Condor, if the above 'guesstimate' is anywhere near the truth.....
Another consideration are the different carrying capacities of the B753s and the B752s.