Should investors apply the trigger on SIA shares?

"Fly High, Fly to the Moon", that's  my sentiments for Singapore Airlines (SIA) shares all along. As expected,  SIA stocks soared up to 9.6% after the announcement of Singapore government's decision to open up of borders to 11 countries worldwide including those in Europe and North America. As of today, SIA shares nose dived down to $5.26 despite of the easing of the travelling curbs.
The question is whether SIA can sustain this decline. Next, is of course should SIA continue to under perform, would the investors be alarmed and apply  a "stop-loss " principle  on  $SIA (C6L.SG)$ or $SATS (S58.SG)$ stocks. Personally, I hope not because this blue chip business has solid fiancial back up. Moreover, SIA
has past experiences of facing more adverse situations without faltering.
Currently, I am holding some portions of the losing $SIA (C6L.SG)$ shares but I am not unduly worried. I have pulled the trigger off for those shares but I will not sell them either, because SIA will remain s strong, reliable company for long term investments.
$SIA (C6L.SG)$ shares' prices have been negatively impacted since mid 2019 when Covid 19 pandemic emerged, and travelling was hazardous internationally.
Pre Covid time, our National aircraft was faring extremely well. Travellers worldwide opt to travel in SIA flights because they are awared that when they fly in SIA, they are embarking on a journey of safety and luxurious comfort. Being a prestigious 5 stars aircraft, SIA offers stella service. This aviation service operates 3% of the 10 current longest flights in the world. The inclusion of more countries VTL (vaccinated travel lanes) will ultimately usher in tourist and business locations from UK, US and Italy which are vital long hauls in markets for SIA.
Moving forward, SIA shares will continue to face some challenges in the early Q4 phase. In hindsight however, investors should focus more on the outlook over the next 2 years. I believe by year end, situation will improve, as more people are vaccinated globally and air travel becomes more flexible. By then more travellers are willing to splurge on the next trip.
Once again we can envision SIA flying high to the Moon. Along with this increase trend in travelling, the other travel-related stocks to gain momentum are:
$SATS (S58.SG)$
$Genting Sing (G13.SG)$
$Air Transport Services (ATSG.US)$
$Shangri-La HKD (S07.SG)$
$Marriott International (MAR.US)$
$Las Vegas Sands (LVS.US)$