Hawk pretty much underlined the major concerns I have with flying out of Plattsburgh, but here are some more points:
- First, you have to add up all the fees on Allegiant (checked luggage, carryon-on, seat reservation, booking fee), to compare to other airlines our of Burlington (JetBlue=almost fee less, United,Delta=checked luggage fee) to compare price
- If youre going to Orlando: positive=direct flight, negative=Sanford airport with no free shuttle, longer taxi ride into the WDW area or need a car rental
- Negative= only 2 flights per week, so if a flight is totally cancelled for real bad weather, the next one is in 3 days (happened to my friends, they were going to Florida for 5 days, they just cancelled the whole trip). This is a bigger concern when flying in winter.
All in, I personally prefer to fly out of Burlington, even if the price is sometimes cheaper out of Plattsburgh (if Im not flying out of Montreal). I favour JetBlue on flights inside the US, so this might tint my perspective. My friends just did a quick week-end in Vegas from Plattsburgh with Allegiant (direct 4-5h flights), and were happy with the deal. They had minimal luggage (3 nights only), were flying without kids,
For my own Vegas trip next month, Im taking JetBlue with a stop in NY, which means a 8-9h trip, but the schedule choice was 20x better (2-3 flights everyday), and I value the In Flight entertainment a lot.