The last accounts showed an operating profit to the year March 2020. Having relatively few passenger flights, the financial performance may not have worsened as much as airports more dependent on that sector.
I understand they generate a fair bit on income from supplying fuel to US military aircraft. The info here (
https://cis.energy.dla.mil/ipcis/Ipcis) shows the uplifts (I don't know the units) which looked pretty healthy in June as you say, but also in November and December when a number of USN P8s were based.
05/20 38,948
06/20 79,367
07/20 187,564
08/20 56,031
11/20 509,592
12/20 731,128
01/21 126,763
03/21 130,309
04/21 196,260
05/21 265,110
06/21 549,238