Well this past three weeks has been a doozy. I've been testing out maintenance mode since late November and have done really well, fluctuating by a couple of pounds but other than that staying right on target. However, the past couple of weeks have been rough and I'm up 5 pounds over my Christmas weight.
I've been traveling for work every-other week. So week 1:
Monday--fly all day
Tues-Thurs -- work
Friday -- fly all day
Then a week of working here locally, then repeat the above.
Now I have 2 weeks off before I have to travel for another week. Here are the pitfalls I encountered and what I intend to do about them:
Breakfast: On flying days, I will look for better choices than omlettes in the airport. There must be a banana and some yogurt SOMEPLACE in these huge airports, and I will find them. On hotel mornings, I will choose the oatmeal option.
Lunch: Airport lunches are hard, but again--surely SOMEONE here offers a salad with dressing on the side. Right? It's up to me to find it. On the working days, the facility offers many healthy options so I really have no excuses for not eating them.
Dinner: More problematic, since the hotel literally has one restaurant (full of bar food) nearby. But I can catch a shuttle to the grocery store and pick up a few healthy things to cook in my hotel room, which has a small kitchen.
Exercise: There is a treadmill in the hotel and I have not stepped on it even once. That will change next time.
I am also back to tracking my food as of this morning, something I haven't done in a couple of months. This five pounds scares me; I know it's not a lot but I can feel it in the way my jeans fit and I know this could be the beginning of a long, slippery slope if I let it be.

!!! Life plan with treats. 
Peapod.com is a good one that is available in most larger cities, but I've used smaller local stores as well. It's all about the planning isn't it?