@EI-A330-300
How is the fleet left ''very stretched''? The net number of aircraft in the fleet is still the same. Little Red has 4 A320s: 2 were leased-in, 2 were taken from the EI fleet. The 2 from the EI fleet are being replaced by the 2 A319s.
Yes, the fleet is currently stretched, however as you say, the final A319 is due ''very soon''. Therefore, your notion of ''a summer of subbed in aircraft'' is baseless.
Its April and they are short aircraft yet one more due but with all the seasonal routes starting in the next few weeks and there is more than one tech fault there operations will have problems. Very few gaps on their schedules for tech problems that are in anyway major.
Could be a run of bad look but one of the VS aircraft when tech and EI had to sen there ones to operate while the new A319 had problems the day after it started service. In May and June there just isn't room for this to happen.