May be you will find the better rquivalent, but the definition is the following:
(American) To double-dip is to get two amounts of pay at the same time, for example more than one income from the same employer or pay from an employer as well as money from the government

If leveraged lease is "predostavleniye v arendu odnim vladeltsam tolko chasti oborudovaniya (or aircraft facilities in your case), gde drugaya prdostavlayetsya drugim", than such portion is leased to a party under the lease agreement at an agreed double-lowered price. At least Dip means price lowering/dicreasing.

...аренда, при которой правила стран арендодателя и арендатора разрешают считать обе стороны собственниками арендуемого оборудования по налоговым соображениям