The objective is not fairness among companies. The objective is to keep the market competitive for the benefit of the consumers. If you can afford a 5 year lea

The objective is not fairness among companies. The objective is to keep the market competitive for the benefit of the consumers. If you can afford a 5 year lease on a slot you won't actively use, you're still stifling the competition. And since EU prohibits EU-governments to subsidy airlines, this paves the way for non-EU countries with deep pockets to eventually control the EU air travel market.