For travelers, 2025 wasn't exactly smooth-sailing at airports.Across the country, flight cancellations climbed to the highest level in three years, as Mother Nature — and Congress — dealt airlines and their passengers a one-two punch of travel woes.So far, 2026 has offered a bit of a headache of its own.Flight cancellations are upAccording to TPG's Best Airlines Report unveiled on Wednesday, flight cancellations last year surged nearly 15% versu…